Originally Posted by staclear also how many gallons of bleach should use for 23000 gallons of water. In a 23000 gallon pool, it takes 1/2 gallon of 6% bleach to raise your Chlorine by 1 ppm...so if you wanted to go from 5 ppm to 20 (shock)you would add 7 1/2 gallons of bleach. Janet
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