Purogene Dosage Calculator

Tell it the job and the tank size. It gives you the exact amount, straight from the EPA-approved label — and prints the sentence it came from, so you can check.

What are you doing?

Keep stored water drinkableWater is already in the tank. Treat it so it stays good.Sanitize the tank — 1 hourThe usual choice. Less product, longer wait.Sanitize the tank — 5 minutesTwice the product, done in five minutes.

How big is the tank?

Or type it ingallons

You need

12.8fl oz

of Purogene for a 40 gallon tank

Citric acid: 1.6 oz
Strength: 50 ppm available ClO₂
Then: Stand one hour, then drain and flush.

Get the 16 oz bottle

Enough to do this job once

For each 50 gallons of tank capacity, mix 16 fl. oz. of Purogene with 1/4 cup (2 oz.) citric acid or equivalent in a plastic container. Let mixture stand five (5) minutes. Dilute activated concentrate with two (2) gallons of potable water.EPA Reg. No. 9804-5, Bio-Cide International, Inc. — approved label

How Far Each Bottle Goes

For keeping stored water drinkable — one fluid ounce treats 30 gallons.

Bottle	Treats	Sanitizes a tank of
4 oz	120 gallons	13 gallons	See it
16 oz	480 gallons	50 gallons	See it
128 oz	3,840 gallons	400 gallons	See it

Why not bleach

Most instructions for an RV fresh water tank still say household bleach, and most of the alternatives offered next to them — vinegar, baking soda, hydrogen peroxide — are offered with the caveat that they do not work as well. Chlorine dioxide is what the registered label covers for sanitizing a potable water storage tank, at a stated concentration and a stated contact time, which is the part a caveat cannot replace.

Use the product according to its label. Nothing on this page is advice about health.