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)
Water looks great, crystal clear
I have read that with SWG and plaster I can keep higher CH but is 500 too high? Should I drain and refill a some?