I think the math is off in their instructions, help me out. I sent them an email asking for clarification. Doubt that 1.33 oz of citric acid is that critical but it does represent an error of greater than 25% in citric acid volume.
The instructions (below) say to add 1/2 teaspoon of citric acid per ounce of Purogene.
Later in the instruction the say 4 oz of citric acid per quart of Purogene. At 32 oz per quart that would mean you would add 16 teaspoons of citric acid (32 oz purogene/.5 tsp per oz of purogene). 16 teaspoons = 2.67 oz not 4 oz.
Disinfecting the drinking water system (50 ppm ClO2 concentration): Place 1/3 fl oz (2 teaspoons) of 3R PUROGENE per gallon of water tank capacity (example: 30 gallon tank x 1/3 = 10 fl oz of 3R PUROGENE) into a clean plastic or glass container.
To this add 1/2 tsp of Citric Acid Activator Crystals (lemon juice may be used, same amount) per ounce of Purogene (4 ounces citric acid/quart Purogene)
Note: Citric acid crystals are added at the rate of
4 ounces per quart of Purogene. Example: 100 gallon tank = 32 ounces of Purogene + 4 ounces of Citric Acid Crystals 1 tablespoon = 3 teaspoons, 1 ounce = 2 tablespoons
http://www.3rodorcon.com/Purogene.pdf
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