PRACTICAL GUIDES • PRODUCT KNOW-HOW

Fleet Wash SupplyLearning Center

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RTU Mixing Calculator

Water and concentrate amounts in gallons
Water : concentrateWaterConcentrate
3:13.751.25
4:14.01.0
5:14.1670.833

Amounts are rounded to 0.001 gallon. Choose one ratio for each chemical and keep Step 1 and Step 2 in separate containers. Your injector dilutes this RTU further during downstreaming.

Injector Dilution Calculator

:1

A 10:1 draw rate means 10 parts pressure-washer water to 1 part RTU drawn from the tank.

Final dilution is the mix coming out of the wand and hitting the truck. Enter the target recommended for your product.

Enter a target final dilution to calculate your RTU mix.

Use your measured water-to-RTU draw rate. Amounts are rounded to 0.001 gallon; check product and equipment instructions before using the calculated mix.

New to two-stepping? Start here

These four guides cover the basics: understand the process, choose chemicals, choose equipment, and prepare your RTU.

  1. Two-Stepping Basics
  2. Polish-Safe vs. Non-Polish-Safe
  3. EZ 2-Step vs. Pro 2-Step
  4. Chemical Dilution Guide

Then use the other guides for the question or problem you’re working on.

Browse the guides

Read guide

Chemical Dilution Guide

Understand water-to-chemical ratios, measure your container mix, and see why injector draw matters to the chemical strength reaching the truck.

 Read guide

Water Spots or Soap Residue?

Understand why water quality matters for chemical mixing and rinsing, and how DI, RO, and TDS checks fit into a wash setup.

 Read guide

Calculate Your Cost per Wash

Calculate RTU yield, cost per prepared gallon, and combined Step 1 and Step 2 chemical cost using measured usage.

 Read guide

How to Check Injector Draw Rate

Measure pickup and outlet flow, distinguish water-to-RTU ratios from total dilution, and use the result in the injector calculator.