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    Difficulty increasing CH

    This is my first post but have been a lurker for years... TFP has been such a help over the last 6 years of pool ownership. So thankful for you all... ~20k gallon pool was replastered this past summer. PebbleSheen finish which is great... love it. Current readings: FC 3.5 TC 0.0 PH 7.7 TA 70...