How Much QDS Should I Use? A Comprehensive Guide

When planning a decontamination project, one of the most common questions is: QDS The good news is that Quick Decon Solutions (QDS) makes the math simple with the calculators below.

Understanding Coverage Rates

Coverage Rate: 1 Gallon Treats 400 Square Feet

A single gallon of mixed QDS solution will effectively treat 400 sq ft of surface area. This is your baseline for calculating how much product to prepare.

Can You Mix Less Than a Full Gallon? Absolutely.

You do not need to use a full 1-gallon packet every time. If you want to mix a smaller batch, simply scale the powder and water proportionally.

**** Calculations based on stainless steel smooth surface - One-pass application

Basic Formula

Mixing Ratio: 24.2 Grams of QDS Powder per 1 Gallon of Water

Each gallon of QDS solution requires:

• 24.2 grams of QDS powder

• 1 gallon of deionized (DI) water

  
  

This ratio is precise and ensures optimal performance.

QDS Usage Calculator

1. Calculate How Much QDS Solution You Need

Input: Total square footageOutput: Gallons of QDS solution required and grams of powder

Formula

Gallons required = Total sq ft ÷ 300

Powder required (grams) = Gallons × 24.2

Example

To treat 1,200 sq ft:

• Gallons = 1,200 ÷ 300 = 4 gallons

• Powder = 4 × 24.2 = 96.8 grams

**** Calculations based on stainless steel smooth surface - One-pass application

2. Mix a Custom Batch

Desired solution	Powder needed	Water needed
1 gallon	24.2 g	1 gallon
½ gallon	12.1 g	0.5 gallon
¼ gallon	6.05 g	0.25 gallon
1 liter	6.39 g	1 liter
500 mL	3.20 g	500 mL

Conversions are based on 1 gallon = 3.785 liters.

Quick Reference Chart

Area to treat	Gallons of QDS	Powder needed
150 sq ft	0.5 gal	12.1 g
300 sq ft	1 gal	24.2 g
600 sq ft	2 gal	48.4 g
1,200 sq ft	4 gal	96.8 g
1,500 sq ft	5 gal	121 g

Final Thoughts

QDS is designed to be flexible. You can mix a full gallon for large-scale decontamination work or scale down to a small batch for spot cleaning. With the simple formulas above, you can calculate exactly what you need every time.