Water Processing Report

1. Purpose

The camera operates in remote locations with no municipal water or drainage. This document specifies a self-contained three-circuit water system that:

• Stores sufficient clean water for 9–14 full-size prints between resupply runs on fresh Blue alone (~15 prints once Brown wash-2 recycling is counted — see §below)
• Recycles used wash water through a three-stage filter train, extending usable supply by approximately 40%
• Contains all waste water in a closed, transportable IBC for proper off-site disposal
• Runs entirely on 12V DC, compatible with a solar/battery off-grid power system

Three circuits:

Circuit	Color code	Purpose	Storage
Blue	Blue — clean	Fresh water supply for processing	2× 1,000L IBC totes (1,800L working fill total — 900L each), stacked side-by-side
Brown	Brown — used	Collected wash water; filtered and recycled back to Blue	1× 1,000L IBC tote, stacked below Blue IBCs
Black	Black — waste	Heavily contaminated water; sealed IBC for off-site disposal	1× 1,000L IBC tote, stacked below Blue IBCs

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2. Cyanotype Wash Water — Chemistry and Constraints

What is in the wash water?

When a cyanotype print is washed, the water picks up:

Compound	Source	Notes
Ferric ammonium citrate (FAC)	Unexposed sensitizer	Water-soluble, pale yellow; low toxicity
Potassium ferricyanide	Sensitizer component	Water-soluble, yellow-orange; low acute toxicity
Prussian blue particles	Exposed image pigment wash-off	Fine blue solid particles, ~1–10 micron
Iron(III) compounds	Oxidation products	Color the water blue-gray

pH: Wash water starts slightly acidic to neutral (pH 6–7) and may drift alkaline as iron compounds accumulate. Alkaline conditions (pH >8) must be avoided — they accelerate slow breakdown of ferricyanide to ferrocyanide and trace cyanide ions.

Environmental note: Cyanotype wash water is low-toxicity and is generally accepted to the municipal sewer in dilute volumes (Photrio forum consensus; corroborated by Safety Data Sheets for FAC and potassium ferricyanide). However, for remote field use with no sewer access, it must be contained and transported for disposal. Do not pour on soil or into waterways.

Source: Photrio — Cyanotype wash water composition · Ask MetaFilter — Disposing of cyanotyping water

What filtration can and cannot do

A sediment + activated carbon filter train will: - Remove Prussian blue particle load (sediment stages) - Reduce some dissolved organics and iron-complex color (carbon stage) - Restore water to a usable secondary-wash quality after 1–3 passes

It will not: - Completely restore water to fresh-water quality - Remove dissolved iron salts fully without iron-specific media - Make the water safe for discharge to ground

Rule of thumb: Recycled Brown water may be reused for the first wash of each print (roughest wash). The final wash must always use Blue (clean) water to avoid re-depositing iron compounds onto the print. After 3 recycle passes, water goes to Black.

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3. Water Volume Calculations

Per-print water requirement

Processing a ~103 sq ft print in the processing tray (4349 × 2,200mm), flooded to 6mm (¼ inch) depth:

Volume per flood = 103 sq ft × (6mm / 304.8) = 103 × 0.0197 ft = 2.03 cu ft
                 = 2.09 × 7.48 = 15.6 gallons ≈ 16 gallons per wash cycle

Wash cycle	Water source	Volume	Drain to
Wash 1 — 5 min	Blue (clean)	16 gal	Brown tank
Wash 2 — 5 min	Brown (recycled)	16 gal	Brown tank
Wash 3 — 5 min	Blue (clean)	16 gal	Brown tank → Black if >3 recycles
Total per print		~32 gal net Blue consumed

Storage capacity vs. print count

Scenario	Blue consumed per print	Prints from 476 gal Blue	Brown recycled
No recycling	48 gal (3 × 16)	~10 prints	0
With recycling (wash 2 from Brown)	32 gal (2 × 16)	~15 prints	~224 gal reused
Brown recycle limit (3 passes)	—	—	166 gal max before going to Black

~15 prints per resupply run — 1,800L Blue supply (2× 900L) with Brown recycling for wash 2.

Water balance — recovered vs. consumed. Of the 1,800L Blue supply, a 14-print run processes ~1,690L (leaving ~110L of dregs, under one print): ~1,245L is recovered into the collection totes (Brown + Waste, ~622L each at their working fill) and ~465L (~31L per print, ~17% of the ~182L gross washed per print) is open-process loss — water carried out in the wet prints (each full-plane muslin sheet, ~9.42 m², leaves saturated to dry), evaporation from the open spray-wash tray, and unrecovered residual (tray-surface film, the sump dead-volume below the P-04 pickup, hose/manifold hold-up). This loss is why two 622L collection totes balance the supply — they are sized for the recovered fraction, not full throughput. (The weight report carries the same ~1,245L recovered figure for its exhausted-state transport mass — 4,546 kg, ~540 kg below the loaded state.)

Extending capacity beyond 14 prints

Maximizing the initial load. The standard 900L-per-tote fill (1,800L → 15 prints) leaves a little residue in each 1,000L tote; topping toward the ~950–1,000L tote limit (~1,900–2,000L) buys ~1–2 more prints (~15–16), transport-validated to a worst-case static tip of 41.0° (see weight report §4.4). To actually realize those extra prints the collection totes must also rise proportionally — they are sized at ~622L each for the 14-print recovery — so the hard ceiling on a single hauled load is the per-tote 1,000L volume, capping it at ~16 prints.

On-site top-up — extended deployment. A deployment can run past the ~16-print single-load ceiling using the external end-wall bulkhead ports — no cargo-door access required: resupply Blue from a water bowser or tanker through the X1 gravity-fill inlet (a 4-way cross feeds both Blue totes), and discharge Brown/Waste through the X3 / X4 drain ports to a holding tank or tanker. In this mode the tote volumes act as buffers, not hard caps, and print count is set by water logistics (bowser visits, disposal access) rather than tote volume. This is a distinct operating mode from the hauled single load: for transport the totes return to their validated fill states (Blue drained, Waste within its return-haul limit). See the Operating Manual for the top-up procedure.

Cooling-water overhead (hot-weather deployments): the evaporative cooler draws clean water from the same Blue circuit (at TAP-01 on the pinhole wall), so it is not free of the processing budget. Its reservoir holds ~4.8 gal (~18 L) and evaporates ~3 L/hour while running (Ventilation Report §5), so a deployment consumes roughly one tankful (~18 L) — about 15% of one print's net Blue draw, or ~1% of the full 1,800 L supply. This is sub-one-print of overhead: it does not move the 15-print count for a 1–2 print outing, but a resupply spent entirely on hot, multi-print sessions should be planned as ~13 effective prints to leave the cooler its margin. The 15-print figure above counts processing water only.

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4. System Architecture

4.1 Blue System — Clean Water Supply

IBC-1 (900L) ──┐
                ├──→ Manifold → BV-01 → P-01 → ACC-01 → BV-05 → Distribution
IBC-2 (900L) ──┘                                                      │
                                                                          ↓
                                                              FLOOD/SPRAY BAR
                                                              ↓ (Processing tray)

• Two IBC totes plumbed in parallel via 1" PVC manifold with isolation valves
• The two Blue totes are tied at the base by a 1" equalization cross-tie (tank body to tank body, low on the totes) so their levels self-balance as P-01 draws and X1 refills
• P-01: Shurflo 2088 12VDC diaphragm pump — 3.5 GPM, 45 PSI, self-priming
• Check valves: only CV-1 is fitted, on the X1 gravity fill — the single flow path with no pump. Every return and drain leg is pump-driven, and the Shurflo 2088 pumps carry an integral 1-way check valve (2088-554-144 datasheet), so dedicated anti-siphon checks on the IBC-2 return, IBC-3 buffer return and IBC-4 waste legs would be redundant and are not used
• ACC-01: 0.75 L (23.5 oz) pressure accumulator — smooths pump cycling, maintains pressure when pump is off
• Low-level float switch on IBC-2 alerts operator when Blue supply is low
• Spray bar: gantry design — 1½×1½×0.062in 304 SS square beam (~12mm pre-camber) spanning the full tray width (4,399mm), with Ø32 wheel carriages rolling on the Yd-sloped tray floor beneath walkway grating. A 3/4" LDPE manifold clipped to the beam side feeds 44 side-tapped 90° down-jet nozzles. See the Processing Tray & Spray Bar report for full mechanical design
• Fill inlet: single external 2" NPT bulkhead fitting (X1) with camlock on the container end wall centerline — gravity feed, no pump required. Inside, an internal 4-way cross (near X1) — where the DV-01 blue recycle also joins — splits to a SIDE entry near the top of BOTH Blue totes (no top-cap access — 52mm headroom), filling them in parallel and gravity-linked — one external hose. Remote resupply from water bowser or tanker (no cargo door access required)

4.2 Brown System — Used Water Recycling

Processing tray sump (P-04 suction pickup)
        │
   P-04 (tray drain transfer pump — suction from sump, lifts ~900mm)
        │
     SV-02 SAMPLE TAP (meter incoming used-water pH → set DV-02 routing)
        │
   3W-DV-02 ──────────────────────────────────────────→ (to IBC-4 waste if heavily loaded)
        │
        ↓  (recycle: the tray drain feeds the filter train)
       F-1 (5-micron MPP sediment)
        │
       F-2 (KDF-55 heavy-metal)
        │
       F-3 (GAC carbon block)
        │
     SV-01 SAMPLE TAP (draw sample → manual meter check before returning)
        │
   3W-DV-01 ──→ pH 6–7, visually acceptable: RETURN TO IBC-3 (Brown buffer)
        │
        └──→ pH drift / discolored: FORWARD TO IBC-4 (waste)

   IBC-3 (600L Brown buffer, side-entry near top — 52mm headroom)
        │
       P-02  ──→  ACC-02 (pulsation damper)  ──→  BV-05  ──→  spray bar   (recycle spray)

Filter train sizing:

The filter train is three separate 4.5"×20" Big Blue housings (Ø184 × 594mm each; Express Water / Geekpure / iSpring), mounted as a horizontal bank high on the pinhole wall — heads pinned near the ceiling, sumps hanging below. Each has 1" NPT inlet/outlet; a single 1/2"→1" bushing reducer matches the 3W-DV-02 recycle branch's 1/2" output to F-1, and F-1 → F-2 → F-3 connect by short 1" PVC jumpers with 90° elbows outside the bodies (full mechanical detail in Plumbing Report §3.1).

Stage	Cartridge (4.5"×20")	Removes
F-1	MPP 5-micron melt-blown polypropylene sediment	Gross sediment, fiber lint, Prussian blue particles
F-2	KDF-55 heavy-metal removal	Dissolved iron compounds from ferricyanide wash water
F-3	CTO coconut-shell activated carbon block	Residual organics, color

The 4.5"×20" cartridges carry ~2× the media of a 10", so service intervals run correspondingly longer; the per-stage replacement intervals live in Plumbing Report §3.1. A single 3-stage combo unit (4.5"×20" cartridges, 1" NPT) is an equivalent alternative that eliminates the inter-housing jumpers — any unit accepting standard 4.5"×20" cartridges with 1" NPT ports will work.

pH management: Two pH sample taps are fitted. SV-02 (½" valve + spout on the P-04 tray-drain discharge, before 3W-DV-02) lets the operator meter the incoming used water and choose the DV-02 routing — recycle into the filter train or divert straight to IBC-4 waste. SV-01 confirms the cleaned water before it returns: draw the post-filter sample at the SV-01 sample tap (½" valve + spout before 3W-DV-01) and meter it. If filtered water reads pH <6, do nothing — slightly acidic is preferred. If pH >7.5, add citric acid solution (10g citric acid in 1 liter water) via the dosing port in the IBC-3 outlet, stir, retest. Do not recycle water with pH >8 to the IBC-3 buffer.

4.3 Black System — Waste Containment

FROM 3W-DV-01 (rejected filter output — pH out of range)
FROM 3W-DV-02 (heavily contaminated drain water — operator judgment)
        │
   IBC-4 (600L waste)
        │
   Sealed, labeled per GHS/OSHA
        │
   TRANSPORT to licensed liquid waste disposal facility

• IBC-4 is a 1,000L caged composite tote with DN50 butterfly valve (S60×6 thread); "600 L"/"1,000 L" are fill levels
• IBC-4 sits in the right end zone in a 2x2 stack: bottom-far position
• Cap sealed before transport; label contents, date, location, UN numbers for ferricyanide/iron compounds
• Drained remotely via external 2" NPT bulkhead fitting with camlock on the container end wall centerline — no need to open cargo doors
• Do not leave IBC valve open — evaporation and UV exposure can drive ferricyanide chemistry

4.4 Processing Tray and Spray Bar

The processing tray and spray bar gantry are fully specified in the Processing Tray & Spray Bar Report. Their role in the water system is summarized here.

Processing tray: A permanently installed 4349 × 2,200mm stainless steel tray sits on the optical zone floor between the film plane rails. A 1:200 Yd-only slope sheets wash water to a near-rim gutter that falls 1:200 inward to a center pickup well (X=2,386). P-04 draws from the center pickup — the suction pops out of the walkway above it and runs under the walkway to the IBC end — no penetration of the tray floor or container floor.

Drain path: P-04 suction pickup → 1" flexible hose over near rim → P-04 pump on the Pinhole Wall filter skid → SV-02 sample → 3W-DV-02 diverter → the 3-stage filter train (recycle) or IBC-4 (Waste).

External drain-out risers: The Brown (IBC-3) and Waste (IBC-4) totes are pumped out to the sealed end-wall ports — X3 via P-05, X4 via P-03. The two vertical drain risers run down the IBC corridor gap and are clamped at ~400mm centers to an 18mm exterior-ply backing spine that tees perpendicular off the Corridor Plumbing Panel. Its top is capped with a horizontal ply shelf that the Blue fill trunk rests on — so both the drain risers and the fill trunk are supported at the T rather than free-hanging.

Spray bar: A 4,399mm full-width 304 SS square beam gantry (1½×1½×0.062in) rolls on the Yd-sloped tray floor beneath the walkway grating. Water from P-01 (Blue supply) reaches the bar via BV-05 → 4m flexible hose → single center feed into the side LDPE manifold → 44 90° down-jet nozzles at 100mm centers, spraying straight down.

Supply path: P-01 → ACC-01 → rigid 1/2" PVC pipe along pinhole wall → BV-05 → coiled flexible hose → bulkhead fitting → beam bore → spray holes.

Containment liner: A fresh 6-mil black LDPE sheet is laid over the tray surface before each session to prevent direct stainless-to-print contact and simplify cleanup.

For full construction details, structural analysis, parts list, and engineering drawings, see Processing Tray & Spray Bar.

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5. Plumbing Specification

Pipe sizing

All pump-driven internal runs use 1/2" pipe, matching the Shurflo 2088 pump ports (1/2"-14 male parallel thread). This eliminates trunk-to-manifold reducer fittings entirely. The three Big Blue filter housings have 1" NPT ports: a single 1/2"→1" bushing reducer feeds F-1, the F-1→F-2 and F-2→F-3 jumpers are short 1" PVC with 90° elbows, and the F-3 outlet connects to DV-01 (1" FNPT). Larger pipe (1" or 2") is used only for the IBC fill/drain lines at the external bulkhead ports and the short filter outlet to DV-01, where gravity flow requires lower restriction. P-03 is mounted separately in the IBC plumbing corridor on the X4 waste drain run.

Internal runs (1/2" PVC Sch-40):

Circuit	Pipe	Size	Pressure rating	Material
Blue supply (IBC → BV-01 → P-01)	Sch 40	1/2" nominal (OD 21mm)	100 PSI min	PVC
Blue discharge (P-01 → ACC-01 → BV-05 → spray bar)	Sch 40	1/2" nominal (OD 21mm)	100 PSI min	PVC
Brown suction (IBC-3 → P-02)	Sch 40	1/2" nominal (OD 21mm)	100 PSI min	PVC
Brown riser (P-02 → F1 inlet)	Sch 40	1/2" nominal (OD 21mm)	100 PSI min	PVC
Tray drain suction (sump → P-04)	Reinforced flex hose	1/2" nominal	pump suction	PVC braid
DV-02 outputs (→ IBC-3, → IBC-4)	Sch 40	1/2" nominal (OD 21mm)	50 PSI min	PVC
DV-01 outputs (→ Blue IBC-2, → Black IBC-4)	Sch 40	1/2" nominal (OD 21mm)	50 PSI min	PVC
ACC-01 inlet/outlet	Sch 40	1/2" nominal (OD 21mm)	125 PSI min	PVC
Spray bar	Sch 40	3/4" nominal	100 PSI min	PVC

Filter unit outlet (1" PVC Sch-40):

Circuit	Pipe	Size	Pressure rating	Material
Filter train (F-3) outlet → SV-01 sample tap → DV-01	Sch 40	1" nominal (OD 33mm)	100 PSI min	PVC

IBC fill/drain (1" PVC Sch-40 — gravity flow, not pump-driven):

Circuit	Pipe	Size	Pressure rating	Material
External fill line (X1 bulkhead → 4-way cross → both Blue totes)	Sch 40	1" nominal (OD 33mm)	50 PSI min	PVC
External drain lines (X3/X4 bulkhead → IBCs)	Sch 40	1" nominal (OD 33mm)	50 PSI min	PVC
X1 fill 4-way cross (X1 in + IBC-1 + IBC-2 + DV-01 recycle)	—	1" PVC cross (cross-100)	50 PSI min	PVC

At 3.5 GPM, flow velocity in 1/2" pipe (ID ~15.8mm) is approximately 1.1 m/s — well within the recommended 0.5–2.5 m/s range for water systems. The longest internal run (~5.5m from manifold to far-column IBC) contributes less than 0.3 bar friction loss at this velocity.

Why PVC Sch-40? Rigid PVC pipe (Sch-40/80, "uPVC") is unplasticized — the plasticizer-leaching concern applies to flexible PVC (vinyl tubing), not the rigid run, and NSF-61 potable-grade rigid PVC is water-safe and chemically compatible with the dilute cyanotype wash (potassium ferricyanide, ferric ammonium oxalate, citric acid). PVC is chosen over HDPE for buildability — it solvent-welds with primer + cement and hand tools, whereas HDPE can't be glued (see the joint convention in Plumbing Report §5.1–5.2). Only the flexible pump-connection hose is braided PVC. Do not use copper or galvanized fittings — iron compounds in the wash water will react.

Fittings and connections

Connection type	Use	Standard
2" camlock (type A+B)	IBC tote inlet/outlet	Aluminum or polypropylene
1" NPT threaded	Filter (F-3) outlet → DV-01, inter-housing jumpers, IBC fill/drain lines	PVC or brass
1/2" NPT threaded	All pump-driven runs, pump ports, manifold connections, ACC-01, ball valves	PVC or brass
1/2"×1" NPT bushing reducer	P-02 riser to F1 filter inlet (1 required)	Polypropylene or brass
2" NPT bulkhead	External fill/drain port (container wall)	PP (EPDM gaskets)
Push-fit / compression	Secondary connections	John Guest / Speedfit style

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6. Electrical — 12V DC Power

Item	Current draw	Hours/print	Wh/print
P-01 Blue pump (Shurflo 2088)	7.5 A @ 12V	0.25 hr (15 min run)	22.5 Wh
P-02 Filter-loop feed pump (Shurflo 2088)	7.5 A @ 12V	0.17 hr (10 min run)	15.2 Wh
P-03 Waste pump (Shurflo 2088) — IBC corridor	7.5 A @ 12V	intermittent (waste disposal only)	—
P-04 Tray drain transfer pump (Shurflo 2088)	7.5 A @ 12V	0.08 hr (5 min run)	7.5 Wh
P-05 Brown drain-out pump (Shurflo 2088) — IBC corridor	7.5 A @ 12V	intermittent (drain-out only)	—
pH meter	<0.1 A	—	<1 Wh
Total per print			~46 Wh

A 100 Ah 12V lithium battery (1,200 Wh usable) provides >25 prints of pump power without recharging. A modest 100W solar panel recharges in ~3–4 hours of sun.

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7. Equipment Layout

See Sheet 2 — Plan View (water-system-sheet2.png) for the water-system-specific P&ID layout. All four IBCs are in the provably shadow-free right end zone (X=4,649–5,893mm), arranged in a 2x2 stack. The optical zone contains only the processing tray and perimeter walkways at floor level.

Container floor plan — all systems (top-down, 1:75):

IBCs are arranged in a 2x2 stack in the right end zone, right-justified to the far end wall. Near column: IBC-1 Blue (top) + IBC-3 Brown (bottom). Far column: IBC-2 Blue (top) + IBC-4 Waste (bottom). A 270mm plumbing corridor between the two columns carries all internal supply and return lines. Total physical capacity: 4×1,000L = 4,000L (totes are filled to working levels, not full). All IBCs are loaded empty through the cargo doors and filled/drained remotely via 3x external 2" NPT bulkhead fittings (X1/X3/X4) through the container end wall. IBC wall clearance is 30mm (near wall to near column edge).

Zone	Contents	X (mm)	Yd (mm)	H (mm)
Right end zone	IBC-1 Blue (top, near column)	4,674–5,893	30–1,046	1,168–2,336
Right end zone	IBC-3 Brown (bottom, near column)	4,674–5,893	30–1,046	0–1,010
Right end zone	Plumbing corridor	4,674–5,893	1,046–1,316	0–2,020
Right end zone	IBC-2 Blue (top, far column)	4,674–5,893	1,316–2,332	1,168–2,336
Right end zone	IBC-4 Waste (bottom, far column)	4,674–5,893	1,316–2,332	0–1,010
Pinhole wall face	Pinhole Wall panel — P-04 + 3-stage filter bank (high, sumps hanging)	3,300–3,976	~100	1,746–2,340
IBC plumbing corridor	Corridor panel — P-01/P-02/P-03/P-05 + ACC-01	4,654–5,104	1,046–1,316	355–1,930
Optical zone floor	Processing tray	280–4,629	60–2,300	0–50
Optical zone	No equipment	260–4,649	—	—

All equipment clears the optical cone at every depth — shadow-free proof in Equipment Layout Report.

Hose routing: The corridor pumps (P-01, P-02, P-05, P-03) mount on the Corridor Plumbing Panel at the front of the IBC stack, reaching into the 270mm plumbing corridor between the two IBC columns — so the pump↔tote suction and return lines are short, running entirely within the corridor to the IBCs' corridor-facing DN50 valves. P-04 (tray drain) and the 3-stage filter stack + the tray-drain skid row sit on the Pinhole Wall filter skid on the pinhole wall face. The longest run is the Blue supply to the spray bar: P-01 → ACC-01 → rigid 1/2" PVC along the pinhole wall to the tray center → BV-05 → ~4m coiled flexible hose → the rolling beam in the optical zone. The tray drain goes the other way — P-04's sump pickup → 1" flexible hose over the near rim → P-04 on the skid → SV-02 → 3W-DV-02 diverter → the 3-stage filter train (recycle) or IBC-4 (Waste); the recycle-spray pump P-02 then returns the clean IBC-3 buffer to the spray bar (→ ACC-02 → BV-05). Waste evacuation pumps P-05 (X3 / Brown) and P-03 (X4 / Waste) sit directly on the corridor drain risers, minimizing pipe to the external end-wall ports. The four lines that connect the corridor equipment to the Pinhole Wall skid run together as a flat ribbon in the dead space under the right-walkway grate — see Plumbing Report §8.1 and Walkway Pipe Routing.

External fill/drain ports: Three 2" NPT bulkhead fittings with camlock fittings on the exterior are mounted on the container end wall centerline, stacked vertically:

Port	Function	Connects to
X1 — Fill Blue	Fresh water supply fill	IBC-1 (top, near column) — gravity feed
X3 — Drain Brown	Used water drain	IBC-3 (bottom, near column)
X4 — Drain Waste	Waste water drain	IBC-4 (bottom, far column)

A single external fill port (X1) feeds an internal 1" 4-way cross in the corridor — where the DV-01 blue recycle return also joins — which splits the flow to BOTH Blue IBCs (each branch side-enters the tote's corridor face near the top, 150mm + flange — no top-cap access, only 52mm headroom). The two top totes fill in parallel, so only one external hose is needed — without a separate cross-connect pipe.

This allows remote filling (from water bowser or tanker) and draining (IBC-3/IBC-4 to disposal tanker) without opening the cargo doors or entering the container. Internal plumbing from each port routes through the 270mm central corridor between the two IBC columns to reach the respective tote. All ports are accessible from the container exterior.

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8. Parts List

Item	Spec	Qty	Supplier	Est. cost
IBC tote (1,000 L caged)	Reconditioned food-grade (prior-food-contents) 275-gal/1000L caged composite tote, DN50 butterfly valve (S60×6 thread); side-entry fittings near top. ~$150/ea local SoCal (Container Exchanger food-grade lots have a ~12-tote min; buy 4 local). Firm ~$150.	4 ea	SoCal reconditioner / Repackify	$600
Bulkhead fitting 2" NPT (polypropylene) (32200)	X1/X3/X4 external fill/drain ports — 2" PP bulkhead tank fitting with EPDM gaskets, clamped through a drilled hole in the container end wall over a flat backing doubler (NOT welded; the corrugation is bridged by the doubler). PP matches the FRPP camlocks it mates. US Plastic 32200 (alt listing itemid 65995), $21.14 firm (2026-07-29) — SS (McMaster 4464K115 $136.70) was over-spec for a plain water port. UV: end wall largely shaded; use brass if long direct-sun exposure.	3 ea	US Plastic Corp	$63
Shurflo 2088-554-144 pump (×5 — P-01 Blue supply / P-02 Brown recycle-spray / P-03 waste evac / P-04 tray drain / P-05 Brown drain) (B00C1M6B1C)	12VDC, 3.5 GPM, 45 PSI, 1/2" NPSM ports; 5 identical pumps, one per water-system duty (P-01..P-05). 2026-07-27: consolidated from 5 lines; firm $100 ea (Amazon B00C1M6B1C)	5 ea	Amazon / Fresh Water Systems	$500
SeaFlo accumulator (0.75 L) (SFAT-075-125-01)	0.75 L, 125 PSI, 1/2" MNPT	2 ea	Amazon	$72
Corridor plumbing-panel ply (23/32" exterior) (303564747)	4×8 ft 23/32" (18mm) RTD Southern Yellow Pine exterior sheathing — rear backing board + drain-riser spine + 3× pump-run side support boards (far + near-lower ~399×420, near-upper ~399×690, #29, cut from the sheet leftover — ~0.62 m² of a 2.97 m² sheet) + spacer offcuts. STANDARD exterior per project rule. Firm $29.30 (Home Depot 2026-07-23). Seal cut edges.	1 sheet	Home Depot	$29
Pump-mount shirt ply (23/32" exterior) (303564747)	4×8 ft 23/32" (18mm) RTD Southern Yellow Pine exterior sheathing — pump-mount shirt (~610×1650 cut) behind P-01..P-05 + 6× spacer blocks. Same SKU as ply-18; 5× Shurflo 2088 (~6.5 kg total) need no more than 3/4". STANDARD exterior per project rule. Firm $29.30 (Home Depot 2026-07-23). May nest with ply-18 in one sheet at cut — carried separate for margin. Double-layer locally if extra pump-rail stiffness wanted.	1 sheet	Home Depot	$29
Pinhole-wall filter-skid backing ply (23/32" exterior) (303564747)	4×8 ft 23/32" (18mm) RTD Southern Yellow Pine exterior sheathing — pinhole-wall backing panel (~1795×1440) that the 3× Big Blue filters + the P-04/SV-02/DV-02 skid row + ACC-02 machine-screw to (via back-face pronged tee-nuts — tnut-quarter/tnut-fivesixteen, #30). PIECED from 2 sheets (butt-jointed): the 1795×1440 face exceeds a single 4×8 sheet 1219mm width. Same SKU as the corridor panels; STANDARD exterior per project rule (dry mounting backboard, NOT marine). Firm $29.30 (Home Depot 2026-07-23). Seal cut edges.	2 sheet	Home Depot	$59
6× steel angle brackets (corridor panel → IBC uprights)	L-brackets fixing the corridor plumbing panel to the IBC-frame back uprights — TEK-screwed to the post (J8, 2× #14 self-drillers per bracket — no weld, bolt-on to the pre-painted frame), rear panel fastened J4 (M8 into captive tee-nut), per ibc-stacking-report §3.5. Price est.	6 ea	Home Depot	$15–$39
Corridor panel mount fasteners (shirt-to-panel screws + lag bolts)	Shirt-to-panel screws + lag bolts landing the brackets into the panel/uprights. Price est.	1 lot	Home Depot	$10–$11
36× #14 self-drilling TEK screws (bracket → post, J8/J9)	#14 × 1in HWH self-drilling TEK screw, #4/5 point (drills the ~6–8mm steel-to-steel: angle leg + the 3mm RHS post wall), 410 SS for the damp container. Attach the corridor-panel L-brackets (J8, 2×6=12) + the side-panel pipe-run L-brackets (J9, 2×12=24) to the IBC posts — NO weld, so the brackets bolt onto a pre-painted frame with no hot work. Price est. per-ea (sold in 100-boxes).	36 ea	Home Depot / McMaster-Carr	$11–$20
12× steel L-brackets (side-panel pipe-run boards) + 4 skid standoff clamps	12× steel L-brackets TEK-screwed to the IBC side-post inner faces (2 per post × 3 side-panel boards: far, near-lower, near-upper) — the side-wall boards carry the PIPE runs (P-clips), NOT pumps; the boards bolt to the landing legs (rear-panel method); + 4 short standoff brackets carrying the forward SV-01/DV-02 skid lines. Cut from 1×1×1/8 steel angle offcuts — attached J9 (2× #14 self-drillers per bracket, no weld), boards fastened J5 (¼-20 into captive tee-nut), per ibc-stacking-report §3.5. MATERIAL est.; FAB (cut) = shop quote (material-now rule). (Registry key kept as 'pump-support-brackets' for cost continuity; they support the pump-run PIPING.)	1 lot	Metal Supermarkets / Home Depot	$12–$24
39× cushioned pipe P-clips (3/4" pipe)	Cushioned (rubber-lined) pipe P-clips securing the pump risers/runs to the ply support boards + spine + skid panel (#29): corridor side boards 17 (far 6 + near-lower 4 + near-upper 7), drain-riser spine 10 (6 riser + 4 far-side X-port lines), filter-skid 12 (6 risers + 6 runs) = 39. Sized for OD21 (3/4") PVC. Zinc + EPDM cushion. Price est. — firm at blueprint.	39 ea	Home Depot / McMaster-Carr	$21–$37
Big Blue filter housing 4.5"×20" (separate) (B0137680E6)	Ø184×594mm/housing (4.5×20), 1" NPT ports, accepts standard 20"×4.5" cartridges (verified 2026-07-27) — three SEPARATE Pentair Pentek 150234 high-flow PP housings on the mounting brackets	3 ea	Amazon	$250
Big Blue housing mounting brackets (×3) (150061)	Pentair 150061 zinc-plated single-housing mounting bracket, one per 4.5×20 Big Blue (×3), machine-screwed to the 18mm ply backing via back-face pronged tee-nuts (#30, re-torqueable). Purpose-built — replaces the welded slotted-angle frame (2026-07-27).	3 ea	Fresh Water Systems	$32
Zinc machine screws — filter housings to ply tee-nuts (831121)	2 per housing × 3 = 6 needed (+2 spare) — Everbilt 5/16"-18 × 2½" ZINC round-head machine screw through the 150061 bracket ear + 25mm standoff + 18mm ply into a back-face pronged tee-nut (tnut-fivesixteen). Machine-screw joint replaces the 5/16 lag screws (#30) — re-torqueable, serviceable. ZINC not SS (dry backboard mount behind the housings — not immersion; Alvin). Sold individually (screw + nut; nut unused). Firm $1.57 ea (Home Depot 2026-08-07).	8 ea	Home Depot	$13
5/16"-18 pronged tee-nut (filter housings) (825091)	Everbilt 5/16"-18 zinc 4-prong tee-nut, 3/8" (9.5mm) barrel — seats from the BACK of the 18mm ply (no front punch-through). 6 needed (2 per Big Blue housing × 3) + 2 spare → 2× 4-pack. Mates filter-machine-screws. Firm $1.57/4-pack (Home Depot 2026-08-07). Bulk alt: McMaster 50-pack $7.47.	2 4-pack	Home Depot / McMaster-Carr	$3
1/4"-20 pronged tee-nut (ply-mount interfaces) (825001)	Everbilt 1/4"-20 zinc 4-prong tee-nut, 5/16" (8mm) barrel — seats from the BACK of the 18mm ply. Captive re-torqueable anchor for every ¼-20 ply-mount interface (#30, 2026-08-07): P-04/SV-02/DV-02 skid row (6), ACC-01/02 (4), pump-mount shirt 5× Shurflo (10), valve brackets (6), EP panel (4), chem shelf (4), Fan-B band (2) = 36 + 4 spare → 10× 4-pack. Mostly water; the EP/shelf/Fan-B pieces (~10) are minor cross-system, carried on this one hardware line. Firm $1.57/4-pack (Home Depot 2026-08-07).	10 4-pack	Home Depot	$16
1/4"-20 zinc machine screws (ply-mount interfaces) (826771)	Everbilt ¼-20 × 1" ZINC combo truss-head machine screw into the tnut-quarter pronged tee-nuts — the machine-screw half of every ¼-20 ply-mount joint (36 + spare → 10× 4-pack = 40). Length 1" gives full tee-nut engagement with ~3mm back protrusion. ZINC not SS (dry backboard mounts; Alvin). Firm $1.57/4-pack (Home Depot 2026-08-07).	10 4-pack	Home Depot	$16
Plywood offcut spacer blocks 25mm (filter skid)	25mm standoff blocks between the housing's mounting ears and the ply backing — sump-bowl hang clearance (the housing machine-screws through them into the back-face tee-nuts). Cut from PLYWOOD OFFCUTS (2026-07-25 — no need for HDPE; dry standoff, not a wet-immersion part).	1 lot	offcuts	$0
MPP 5-micron sediment cartridge 4.5"×20" (B0CJCVZ1L5)	Pentek DGD-5005-20 dual-gradient-density 5-micron sediment cartridge (F-1 stage); ~50-print interval. $61.66/2-pack = $30.83 ea.	2 ea	Amazon	$62
KDF-55 heavy-metal cartridge 4.5"×20" (B0DY1ZK47Z)	KDF-55 media for dissolved iron/metal removal (F-2 stage); ~60-print interval. Aquaboon 20×4.5 KDF whole-house cartridge (proper KDF media — supersedes the earlier VEVOR chlorine-only cartridge).	1 ea	Amazon	$80
CTO carbon block cartridge 4.5"×20" (B07ZHPB6MB)	Coconut shell activated carbon block (F-3 stage); ~40-print interval. Aquaboon CTO, $79.79/2-pack = $39.90 ea (same brand as the KDF/sediment cartridges).	2 ea	Amazon	$80
Banjo V050FP ball valve 1/2" FNPT (803HZ1)	PP full-port quarter-turn 2-way; pump-suction isolation BV-01 (P-01), BV-02 (P-05), BV-06 (P-03). Grainger firm $24.14 (checked 2026-08-07; was US Plastic $44.27).	3 ea	Grainger	$72
Banjo V050FP ball valve 1/2" FNPT (803HZ1)	PP full-port quarter-turn 2-way; pump-suction isolation BV-03 (P-02). Grainger firm $24.14 (checked 2026-08-07; was US Plastic $44.27).	1 ea	Grainger	$24
Banjo V050FP ball valve 1/2" FNPT (803HZ1)	PP full-port 2-way; BV-04 (TAP-01 chem-tap isolation) + BV-05b (spray-bar ON/OFF, at the spray-bar feed). Grainger firm $24.14 (checked 2026-08-07). Spray selection is split into TWO 1/2" valves — this 2-way for on/off + a 1/2" 3-way Blue/Brown selector (valve-3way-half) — replacing a single 3/4" 3-way L-port (no reducers, no L-port OFF-detent risk).	2 ea	Grainger	$48
Banjo V100FP ball valve 1" FNPT (30653)	PP full-port; V1/V3/V4, VB1–VB3 (IBC fill/drain)	6 ea	US Plastic Corp / Amazon	$297
3-way diverter valve 1/2" FNPT (22365)	L/T-port PVC-compatible; 3W-DV-02 (tray drain) + BV-05a (spray Blue/Brown SELECTOR — 2 inlets Blue+Brown → 1 outlet to BV-05b on/off). Same valve as the diverters.	2 ea	US Plastic Corp	$48
3-way diverter valve 1" FNPT (31268)	L/T-port; 3W-DV-01 (filter output)	1 ea	US Plastic Corp	$61
pH sample tap (SV-01) — 1/2" PP ball valve + barb spout + branch tee (36903)	Filtered-water sample draw before 3W-DV-01; 1/2" PP sample valve (US Plastic 36903) + downturned 1/2" hose barb on a 1"×1/2" reducing branch tee, panel face above spill line	1 ea	US Plastic Corp	$19
pH sample tap (SV-02) — 1/2" PP ball valve + barb spout + branch tee (36903)	pH sample on the P-04 tray-drain discharge, before 3W-DV-02; same build/SKU as SV-01 (US Plastic 36903 $19.26 — priced under SV-01; applied to SV-02 as the identical build)	1 ea	US Plastic Corp	$19
2" polypropylene camlock pairs (M+F) (30754)	External bulkhead connections (X1/X3/X4 + spare). 2026-07-27: pair = US Plastic 30754 female coupler $16.23 + 30619 male adapter $6.70 = $22.93 (Banjo FRPP, EPDM)	4 pair	US Plastic Corp	$92
1/2" PVC Sch-40 slip 90° elbow (PVC023000600HD)	All pump-driven run bends. Charlotte PVC Sch-40 90° S×S — CONFIRMED slip / solvent-cement (2026-07-28), NOT threaded.	14 ea	Home Depot	$10
1" PVC Sch-40 slip 90° elbow (PVC023001000HD)	1" PVC slip run bends (joint convention §5.1): IBC bends, filter outlet to DV-01. 2026-07-27 fork b — was threaded Banjo FRPP $4.59. Charlotte PVC023001000HD 90° S×S.	4 ea	Home Depot	$6
1/2" PVC Sch-40 slip tee (PVC024000600HD)	Blue suction/discharge tees, branches. Charlotte PVC Sch-40 S×S×S — CONFIRMED slip / solvent-cement (2026-07-28), NOT threaded.	6 ea	Home Depot	$5
1" PVC Sch-40 slip tee (PVC024001000HD)	1" PVC slip run tees (joint convention §5.1): 3× IBC drain. 2026-07-27: X1 fill split dropped — X1 is a 4-way cross (cross-100), not a tee. Charlotte PVC024001000HD S×S×S.	3 ea	Home Depot	$6
1/2" PVC slip×MNPT male adapter (PVC021090600HD)	½" landings (24 — P&ID takeoff 2026-07-28, +ACC-02 2026-08-04): 6× BV ball valves (BV-01–06, run side) + 5× pump discharges (P-01–05, hose→run) + 3W-DV-02 (3 ports) + SV-01/SV-02 taps (2) + accumulator ACC-01 (1, slip×FPT) + accumulator ACC-02 (2 — inline IN+OUT on the recycle-spray line) + 2× ½" unions (4, slip×MNPT each side) + bushing-reducer ½" run side (1). Charlotte PVC021090600HD.	24 ea	Home Depot	$19
1" PVC slip×MNPT male adapter (PVC021091000HD)	1" landings (26 — P&ID takeoff 2026-07-28): 6× V100 valves (V1/V3/V4, VB1–3, run side) + 8× s60-adapter IBC-valve landings (each lands on its own 1" glued-run segment) + 3W-DV-01 (3 ports) + CV-1 (2 ports) + 5× filter housing ports (F-01 OUT, F-02 IN/OUT, F-03 IN/OUT; F-01 IN = bushing-reducer) + 2× Blue equalization bulkheads. Charlotte PVC021091000HD.	26 ea	Home Depot	$30
1" PVC 4-way cross fitting (B0CGGV74MB)	X1 fresh-fill 4-way (confirmed 2026-07-27): X1 inlet + IBC-1 + IBC-2 + DV-01 blue-recycle riser all join here on the corridor spine, then distribute to both Blue totes. 1" PVC cross — slip glue joint, gravity/low-pressure fill. Design of record: the 3D model + corridor panel-layout + plumbing-report all build this cross.	1 ea	Amazon	$6
1/2" PVC Sch-40 slip coupling (PVC021000600HD)	Permanent solvent-weld run joins (4×). Charlotte PVC Sch40 S×S coupling.	4 ea	Home Depot	$3
1/2" PVC union (serviceable break) (PVCU12F)	True hand-unscrew unions at the 2 points where a whole sub-assembly must come out as a unit (pump manifold + filter-bank inlet). Apollo ½" PVC FIP×FIP (threaded) union — lands on the slip run via a slip×MNPT adapter each side (4 total across the 2 unions, in the pvc-adapter-half allowance).	2 ea	Home Depot	$10
1/2"×1" NPT bushing reducer (PVC021121800HD)	P-02 riser → F1 filter inlet — THREADED (lands on the filter = hard component, per the joint convention). Charlotte PVC Sch40 1×½ reducer bushing	1 ea	Home Depot	$3
S60×6 female buttress → 2" MNPT IBC tote adapter (B095SCHBC6)	IBC DN50 tote outlet (male S60×6) → 2" male NPT, polypropylene (Granatan). No US single-piece S60→1" NPT exists (the 1" ones are BSP or garden-hose thread), so reduce 2"→1" via s60-reducer. $9.99 firm (2026-07-29).	8 ea	Amazon	$80
2"→1" PVC Sch-80 reducing coupling (FNPT×FNPT) (PVC021071300HD)	Charlotte 2"×1" PVC Sch-40 reducer bushing, SPIGOT×SLIP (solvent-weld), $3.21 (2026-07-29). INTERFACE FLAG: the s60-adapter output is 2" MALE NPT and a spigot×slip bushing is glue-only, so it needs a 2" MPT×socket transition to mate (or swap to a 2"FNPT×1" reducer). Verify the tote-adapter interface at the bench.	8 ea	Home Depot	$26
1" MNPT × 1" hose barb (Banjo HB100) (31527)	Tote-side barb — 1" MNPT threads onto the reduced tote-adapter port; flex hose slips onto the barb. Banjo HB100 glass-reinforced PP, 300 psi. $1.79 firm (2026-07-29).	8 ea	US Plastic Corp	$14
1" FNPT × 1" hose barb (Banjo) (31544)	Run-side barb — flex hose slips on; its 1" FNPT receives the pvc-adapter-1in (1" MNPT) that glues to the run. Banjo glass-reinforced PP. $3.00 firm (2026-07-29).	8 ea	US Plastic Corp	$24
#20 stainless hose clamp (10-pack) (IDL0410PK)	2 clamps per flex jumper × 8 = 16 (2× 10-packs, 4 spare). Apollo 300-series SS #12 (½in–1¼in), external. $18.52/10-pack (2026-07-29). SIZE FLAG: verify the #12 (max 1¼in) closes over the 1¼in-OD tray-suction hose + barb — a #16 may be needed if it bottoms out.	2 10-pack	Home Depot	$37
1" bulkhead tank-body fittings (Blue equalization cross-tie) (32194)	Low tank-body penetration in each Blue tote (IBC-1 + IBC-2) for the 1" equalization cross-tie that self-balances the two Blue levels (run made from the 1" PVC stock). Confirmed firm $12.62 (2026-07-28); SKU 32194 (alternate listing itemid 65992).	2 ea	US Plastic Corp	$25
1" NPT spring check valve (CV1 — X1 gravity fill) (31415)	PVC body, EPDM seal, 1" FNPT × FNPT. Only CV-1 (X1 fill) remains — the Shurflo 2088 pumps have integral check valves, so CV-2/CV-3/CV-4 are redundant and dropped	1 ea	US Plastic Corp	$24
Steel flat bar 25×3mm — ribbon support cross-brace (6775T37)	Low-carbon steel flat bar 25×3mm × 3 ft. Welded between the two right-walkway long bearers at 4 stations to carry the under-walkway pipe ribbon (four corridor↔pinhole lines); 4 braces ~300mm each = cut from 2× 3-ft bars (2 spare pieces).	2 3ft bar	McMaster-Carr	$35
Cushioned pipe clip (B01HPE188Q)	Cushioned clamp for ½" pipe (0.84"/21mm OD); secures the four under-walkway ribbon lines to the support cross-braces (4 lines × 4 supports). Sold in 20-packs at $9.99 ($0.50/ea); one pack covers the 16 + spares.	16 ea	Amazon	$8
Thread seal tape (PTFE)	1/2" wide, 260" roll	4 roll	Home Depot	$8
1/2" PVC Sch-40 pipe (30-05010HD)	All pump-driven runs (~80 ft = 8× 10-ft sticks), PVC Sch-40 solvent-weld (IPEX potable-pressure). Matches pump port size.	8 stick	Home Depot	$38
1" PVC Sch-40 pressure pipe (22405)	IPEX 1"×10 ft white PVC Sch-40 POTABLE PRESSURE water pipe (model 22405); ~40 ft = 4× 10-ft sticks; filter inter-stage/outlet + IBC internal fill/drain manifold + X1 fill + equalization tie. Pressure-rated (2026-07-28). Re-count DONE 2026-07-29: 2→4 sticks — the IBC-zone 1" internal fill/drain (§5 pipe table, ~39 ft total) was omitted from the old 20 ft estimate.	4 stick	Home Depot	$35
3/4" PVC Sch-40 pipe (PVC-04007-0600)	Spray bar run, PVC Sch-40 pressure pipe (plain end), 2× 10-ft sticks. $5.76/stick (sent $576 — read as a decimal typo; ¾" pressure pipe sits between the ½" $4.81 and 1" $8.65). Re-count vs actual run length.	2 stick	Home Depot	$12
1/2" ID reinforced braided PVC hose (60703)	Pump flexible connections — a braided ½" jumper on BOTH ports (suction + discharge) of all 5 pumps for vibration isolation (#29; P-04's suction is the 1" tray-drain hose, so 9 ½" jumpers). Short corridor jumpers cut from 3× 6ft lengths (~18 ft). De-couples each pump from the rigid PVC run so the solvent-weld joints can't fatigue-crack.	3 length	US Plastic Corp	$18
1/2" barbed coupling (pump flex jumpers) (318470443)	Rain Bird BC50-20 ½" barbed coupling — 2 per braided pump-flex jumper × 9 = 18 (+2 spare) → 1× 20-pack. Barbs into the braided-hose ends (clamped). INTERFACE FLAG: the pump ½" NPSM port takes a ½" MNPT×barb adapter (drawn from the ½" adapter allowance) — verify the barb-to-port interface at the bench. Firm $12.48/20-pack (Home Depot 2026-08-07).	1 20-pack	Home Depot	$12
1/2"–1 1/4" SS hose clamp (pump flex jumpers) (202262870)	Everbilt 671255E ½–1¼" SS hose clamp — 2 per braided pump-flex jumper × 9 = 18 (+2 spare) → 2× 10-pack. Secures each barb joint. Firm $17.98/10-pack (Home Depot 2026-08-07).	2 10-pack	Home Depot	$36
14 AWG duplex marine wire (MCB14-2)	Tinned-copper 2-conductor marine cable, cut to 25 ft (pump feed run)	25 ft	Waytek Wire	$17
Anderson Powerpole connectors 30A	Pump connections — one pair per pump (P-01..P-05). Sold in 10-pair packs at $12.99 (unassembled 30A); one pack covers the 5 pairs + spares.	5 pair	Powerwerx	$6
15A blade fuse (B07WP5FWJJ)	15A ATC/ATO blade fuse, 100-pack — pump Circuit C single feed (all pumps) + spares.	1 pack	Amazon	$8
6-mil black LDPE sheeting (59803)	Film-Gard 8 ft × 100 ft × 6-mil black poly (800 sq ft). Water splash/light-proof sheeting + the tray liners are cut from this same roll (tray-liner line retired 2026-07-27 — same material, ~10 liners/roll). Re-count area if the water use alone exceeds 800 sq ft.	1 roll	Home Depot	$55
Apera Instruments AI311 PH60 pH meter (B01ENFOIQE)	Waterproof, 0–16 range, ±0.01 accuracy	1 ea	Amazon	$80
pH calibration solution set (B09DCP4HNH)	BOJACK pH 4.00 + 6.86 + 9.18 buffer powder sachets — meter recalibration	1 set	Amazon	$8
Citric acid, food grade, 6 lb (B0F1CKRT7G)	pH adjustment (acidifier), 6 lb/bag	2 bag	Amazon	$60
Chemical-resistant labels (GHS) (B0BWFW5481)	GHS pre-printed pictogram secondary-container labels, perforated — for the 4 IBC totes (pictograms pre-printed; hand-write the reagent name). Amazon B0BWFW5481 $23.99 firm (2026-08-01).	1 pack	Amazon	$24
Nitrile gloves, box of 100 (B0CMZ5VXMS)	TitanFlex nitrile, textured, box of 100 (size M/L).	2 box	Amazon	$30
Water total				$3,471–$3,533

The processing tray (§6.1), spray bar (§6.2), and IBC stacking frame are itemized in their own reports — Processing Tray & Spray Bar and IBC Stacking — and roll into the Total cost summary below.

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Total cost summary

Category	Low estimate	High estimate
Water equipment — §8 BOM (IBC storage, pumps + accumulator, 3-stage filter train, valves & fittings, pipe, wiring, consumables)	$2,073	$3,123
Processing tray (see Processing Tray report §6.1)	$1,473	$2,121
Spray bar assembly (see Processing Tray report §6.2)	$587	$599
TOTAL	$3,660	$5,513

The Water-equipment row is the generated §8 parts:water BOM total (single source of record for the water subsystem — storage/pumps/filters/valves/pipe/consumables); the tray and spray-bar rows are costing.py blocks. The TOTAL is a hand sum of the three and should itself become a generated block (Phase-1 backlog).

Used IBC totes drive significant savings vs. new. The parts list consolidates to 4 primary suppliers: Amazon (~30 line items — qualifies for bulk/subscribe discounts), McMaster-Carr (tray hardware — single order, fast shipping), Ferguson (PVC pipe — call for contractor pricing), and Online Metals (SS sheet). Obtain quotes from Ferguson before ordering pipe from Amazon — trade counter pricing is typically 20–30% below retail.

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9. Maintenance

Task	Frequency	Notes
Replace F-1 (5-micron MPP sediment)	~Every 50 prints	Visually inspect — replace sooner if heavily discolored (intervals: plumbing §3.1)
Replace F-2 (KDF-55 heavy-metal)	~Every 60 prints	Replace sooner if flow rate drops
Replace F-3 (GAC carbon block)	~Every 40 prints	Replace if taste/odor test fails
Flush Brown IBC-3	Every 5 prints	Rinse with clean water, inspect for sediment buildup
pH check of filtered output	Every session	Before returning Brown water to Blue system
Drain and rinse Blue IBCs	Annually (or before long storage)	Prevent biofilm formation
Inspect IBC-4 valve and cap	Before every transport	Check for leaks

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10. Safety Notes

1. Ferricyanide in alkaline conditions: Do not allow IBC-4 waste water to contact strong alkalis (sodium hydroxide, bleach). In alkaline + UV conditions, ferricyanide can release trace cyanide ions. Keep pH < 7.5 in all containers. This is a theoretical rather than acute risk at the concentrations involved, but is worth managing.

2. Prussian blue is non-toxic — it is approved as a human antidote medication in some contexts — but the fine particles are a skin/eye irritant. Wear nitrile gloves and eye protection when handling wash trays.

3. Citric acid dosing: Always dissolve before adding to tank. Adding dry acid to iron-rich water can cause a brief exothermic reaction and bubbling. Mix in a separate container first.

4. IBC-4 waste transport: Ensure IBC cap is sealed and ball valve is closed before transport. Label contents before transport. The liquid is not classified as DOT hazardous material at these concentrations, but label clearly and keep upright. Drain remotely via external bulkhead port to a disposal tanker.

5. Electrical: Each pump draws 7.5A at 12V. All five pumps share a single Circuit C (12V, 15A fuse, 14 AWG) and run one at a time, so the single feed carries them — see Plumbing Report §3.2.

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11. Source References

Chemistry and safety: - Photrio — Composition of cyanotype wash water - Ask MetaFilter — Disposing of cyanotyping water - FMCSA ELDT curriculum (HDPE chemical resistance reference)

Suppliers — consolidated by provider (see shopping list for direct part links): - Amazon — Pumps (Shurflo 2088), accumulator, filter housings, cartridges, Banjo valves/fittings, check valves, IBC adapters, electrical, consumables - McMaster-Carr — Bulkhead fittings, tray hardware (bulkhead union, gasket, bolts) - Ferguson Plumbing Supply — PVC pipe (1" and 3/4" Sch-40) - Container Exchanger — Used IBC totes, California - Online Metals — 304 SS sheet for processing tray - Ronaqua — GAC carbon filter cartridges