Build outcome

A leak-free RO/DI system with a known flow path and a known TDS output.

Build SOP

Maintenance habits

check TDS before jobs
service carbon/membrane/resin based on performance
store out of sun; protect from freezing

Do this next (assignment)

Run this lesson on a real job or a mock walkaround.
Capture a Proof Pack for the scenario.
Do the Final Walk.

References (SOPs + checklists)

Proof Pack SOP: 04_sops/proof-pack/proof-pack-sop-v1.md
Final Walk checklist: 04_sops/universal/final-walk-checklist-v1.md

Printables

Operator Checklist Pack (truck copy): 03_curriculum/printables/operator-checklist-pack-v1.md

Field Guide & Interactive Calculator (tbsoftwash.com)

🪟 Pro Window Cleaning, Hard-Water Removal & 0-TDS WFP Guides:

Beginner's Guide to Traditional Window Cleaning Tools →

Commercial Storefront, Awning & 0-TDS Window Washing in Tampa Bay →

How We Remove Hard Water Stains from Glass →

Best Water-Fed Pole Hose Guide →

Gear Box (Amazon)

Traditional & Water-Fed Pole (`0-TDS`) Window Cleaning Kit

Max Water 4" x 40" 4040 Commercial Reverse Osmosis Membrane — heart of a commercial pure-water WFP cart.
PUREPLUS 10" Activated Carbon Block Pre-Filter (4-Pack) — strips municipal chlorine before it destroys your RO membrane.
Color-Changing Mixed-Bed Deionization (DI) Resin Refill + Hydronix 10" Refillable DI Filter Canister — polishes water down to 000 PPM TDS.
Digital TDS Water Quality Tester Meter — verify 0–5 PPM output before touching glass.
Water-Fed Pole Window & Solar Washing Brush Head — agitates hydrophobic bird droppings and salt spray.
Gardiner Water-Fed Pole — lightweight rigid carbon pole for 2–4 story pure-water glass and frame scrubbing.
Ettore All-Purpose Squeegee (12-Inch) + Ettore Mighty Window Washer (10-Inch).
Ettore 43012 Extension Pole + Ettore 59090 Wrap-Around Flow Brush.
Arkwright Surgical Huck Towels — zero-lint detailing for edges, sills, and frames.
Dawn Ultra Dish Soap — clean squeegee glide without heavy residue.
Bar Keepers Friend Powdered Cleanser + Oxalic Acid 99% Powder — mineral and sprinkler hard-water spot restoration on tempered glass.

Disclosure: As an Amazon Associate, we earn from qualifying purchases.

🛡️ Springboard Week 3 Check — Pure Water (WFP / RO-DI)

Safety Gate Check

Pass this quick operator knowledge check (80%+) to verify SOP mastery and unlock your track certification.

1. In a 4-stage RO/DI pure water cart, what protects the expensive RO membrane from municipal chlorine damage?

Select an answer for all 1 questions, then click Verify Answers.

← Week 3 — WFP/RODI: Premium Upgrade (Lesson)Week 3 — Selling Exterior Window Maintenance Plans (Lesson) →

Week 3 — RO/DI Build + Maintenance (Lesson)