Module 2 — Equipment & Chemicals: WFP/RODI Equipment Basics (Lesson)

What you’re doing today

You’re learning the WFP/RODI stack at a practical level: what it is, what the parts do, and what actually matters on the job.

Why this matters

WFP/RODI wins on:

• safety (less ladder)
• consistency
• premium positioning

But only if your water is actually pure and your technique is clean.

Tools & materials (minimum viable)

• TDS meter (non-negotiable)
• A basic RO/DI system
• A water-fed pole (WFP)
• A clean brush + good rinse technique

The one number that matters

TDS is the scoreboard.

If you can’t measure it, you can’t manage it.

Step-by-step: WFP/RODI startup check (foreman routine)

1. Check source water connection.
2. Check your TDS reading (in → out).
3. Flush/prime as needed.
4. Inspect brush and jets (clean, no grit).
5. Clean top-down with good rinse discipline.
6. Do a final rinse pass.

Decision points

• If TDS is high:

  • stop and fix water quality before doing “spot-free” promises.

• If windows dry with spots:

  • it’s usually water quality, technique, or frames leaking contaminants.

Common mistakes + fixes

• Mistake: skipping TDS checks

  • Fix: treat TDS like fuel gauge.

• Mistake: blaming the customer’s glass

  • Fix: confirm water quality + technique first.

What good looks like

• Consistent spot-free dry
• No ladder required for standard second-story glass (where feasible)

How to prove it (Proof Pack)

• before/after of a representative window set
• note: "WFP/RODI used" + any limitations (sun, heavy contamination)

Do this next (assignment)

• Take 3 TDS readings (tap, post-RO, post-DI) and write them down.
• Clean 2 windows and verify dry-down.

References (SOPs)

• RO/DI overview:
• RO/DI build SOP:
• WFP SOP:

Printables

• Operator Checklist Pack (truck copy):

Gear Box (Amazon)

(Insert the relevant Gear Box module for this lesson here.)

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