Water Treatment
Water treatment for stored drinking water
Keeping water in a tank drinkable for years, and sanitizing the tank it sits in — with chlorine dioxide, the disinfectant US municipal systems have used since 1944.
4.6213 ratings on Amazon
Free shipping over $49, a flat $5.99 below it, and thirty days to return anything unopened
From the EPA label
How much do I need for my tank?
Sanitizing a tank, one-hour method. All the methods and sizes
- EPA Reg. No. 9804-5
- Made in the USA
- Ships from our own stock
- Thirty days to return it unopened
The three we stock
Everything here is in our own warehouse, not ordered in when you buy it.
Purogene Drinking Water Preserver — 4 oz
4.6110 ratings on Amazon
Keeps 120 gallons drinkable
$16.95List $29.95Save $13.00$4.24/ozIn stock, ships today
Best sellerPurogene Drinking Water Treatment — 16 oz
4.766 ratings on Amazon
Keeps 480 gallons drinkable
$28.95List $59.95Save $31.00$1.81/ozIn stock, ships today
Purogene Water Treatment Preserver — 128 oz
4.437 ratings on Amazon
Keeps 3,840 gallons drinkable
$89.96List $109.96Save $20.00$0.70/ozIn stock, ships today Best per oz Ships free
What one bottle covers
| Bottle | Keeps drinkable | Sanitizes a tank of |
|---|---|---|
| 4 oz | 120 gallons | 13 gallons |
| 16 oz | 480 gallons | 50 gallons |
| 128 oz | 3,840 gallons | 400 gallons |
One fluid ounce per 30 gallons to keep stored water drinkable — 5 ppm available chlorine dioxide. Sanitizing a tank is a separate, stronger procedure at 16 fl oz per 50 gallons of capacity. Both are the approved label’s own figures for EPA Reg. No. 9804-5.
Why chlorine dioxide and not bleach
Most instructions for an RV fresh water tank still say household bleach, and most of the alternatives offered beside it — vinegar, baking soda, hydrogen peroxide — come 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.
It is a different chemical from chlorine, despite the name, and it does not leave the taste. That is why it is used on water people are going to drink: US municipal systems have treated with it since 1944.
Stored properly and sealed, treated water stays drinkable for five years. That is the whole point of the product — water put away now and forgotten until it is needed.
How it goes
Work out the dose
One fluid ounce per 30 gallons to preserve stored water. Sanitizing a tank is a stronger, separate procedure and the calculator does both.
Add it and leave it
Straight into the tank or the container. Nothing to run, nothing to plug in, nothing to replace.
Drinkable five years on
Sealed and stored properly, that is what the product is for: water put away now and forgotten until it is needed.
Every figure comes from the approved label, printed beside the sentence it came from. Work out the dose for your tank →
Which one do I need?
A row of sizes cannot answer this, so here it is in words.
4 oz — a car, a go-bag, one barrel
Treats 120 gallons. The size to keep in a vehicle or with emergency supplies, where it will sit unopened for years.
16 oz — an RV, a cabin, a family store
Treats 480 gallons, or sanitizes a 50-gallon tank. The one most people want, and the one most people buy twice.
128 oz — a well, a farm, a long season
Treats 3,840 gallons. Cheapest by the ounce by a wide margin, and the size that pays for itself if you treat more than one tank a year.
Common Questions
- How long does treated water stay drinkable?
- Five years, stored properly and sealed. That is what the product is for: water put away now and forgotten until it is needed.
- How much goes in per gallon?
- One fluid ounce per 30 gallons to keep stored water drinkable — 5 ppm available chlorine dioxide. Sanitizing a tank is a different, stronger procedure, and the calculator does both.
- Does it taste of chlorine?
- Chlorine dioxide is a different chemical from chlorine and does not leave the same taste. At the concentrations on the label it is used precisely because the water stays drinkable.
- Can I use it in an RV fresh water tank?
- Yes — that is the commonest use. The label covers sanitizing potable water storage tanks, and there is a step-by-step guide for RV tanks on this site.
Read more
Buying by the case
Schools, laboratories and resellers: a quote, an invoice against a purchase order and a W-9 the same day — from Exact Sales LLC, the same people who pack the boxes.