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    High CYA - how much to drain?

    [Split by moderator - Please keep questions in your own thread. Thanks, jblizzle] I'm having a similar problem. Although my CYA is not quite that high. It's north of 120 though. FC - 13 (I'm keeping it high because of the CYA issue) CC - 13 pH - 7.4 TA - 90 CH -200 CYA - 130 Pool...