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I will retest the water tonight and verify the CYA. Is the calcium not dissolving into the water because the calcium level is too high? Or is there some other reason it's not dissolving? I would have expected the CH levels to be high. I don't think it matters, but I've also got a black...

22,000 gallon plaster pool FC = 5.5 CC = 0 PH = 7.6 TA = 60 CH = 380 CYA = 35 Water Temp = 80 degrees I'm using Leslie's (I know that's my first problem) Trichlor 3" pucks in a Rainbow 320 chlorinator and typically shock the pool once a week during the summer with Leslie's Calcium Hypochlorite...