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4-15-10 I have 4 year old pool, 20000 gal, plaster bottom, fiberglass walls with SWG. Here are current numbers FC 7(solar cover has been on) PH 8 (added 1 qt muriatic acid) TA 100 CH 500 CYA 45 Temp 83 Water looks great, crystal clear I have read that with SWG and plaster I can keep higher...