In a 26,000 gallon pool, each quart will raise your chlorine by approx. 0.6 ppm. So, for every 2 jugs (3 quarts of 6% bleach in each jug) it will raise your level by about 3.6 ppm. (Use 3.5 so the math will be easier.) Hope that helps you calculate how much you need to add.
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