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    Imbalanced with algae - last few weeks of the pool season

    Hi everyone. I was hoping I could get a little advice. I had my 6500-7000-gallon above-ground pool balanced where I though was perfect about a month ago. About 3-4 FC, a pH of 7.4, TA around 100, and CYA at 30-40. I went away and left my father in charge for a month, and now I’m battling...