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I keep getting mustard algae (MA), despite the fact that after my first instance of MA I keep FC relatively high (8.5+) compared to the level on the SWG section of the Chorine/CYA Chart on this site. I maintain pH 7.5-7.8, CYA 60-70, TA 60-80, CH ~300, salt ~ 3100. I've read posts that say CC...