Wow! 3 gallons of 12% bleach at a time in a 24 ft AG??? That would increase your chlorine level by about 27 ppm. I sure hope your cya is really high to compensate for that kind of chlorine level or else you are probably killing your liner. We need some numbers instead of just 'balanced' to be able to advise you. In the meantime, don't add any more 3 or 4 gallon doses of bleach.
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