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18 x 36 Oval with vinly liner. Hayward s-200 filter and Hayward 1.5 hp super pump. FC = 1 TC = .5 PH = 7.5 ALK = 80 CH = 60 ( Not really worried since it's a vinyl liner) CYA = 120 (I think this is my problem). :grrrr: I opened the pool a few weeks ago and PH was good and ALK was a little...