I wouldn't dump 20 gallons of bleach in your pool without knowing more about the pool. Can you take a water sample into a local pool store and have them test for Cl, pH, Alk, and CYA? (And CH if a plaster pool). If you'll post those numbers, along with how many gallons your pool holds (or its dimensions), we'll be happy to help you figure out how much to add to shock it. Also, do you have a SWG?
Janet
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