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Hi, new member. 16500 gal. white plaster inground pool. FC 12 - 20 pH 7.8 T/A 90 CH 220 CYA 75 So. california area where we get a lot of sun. I am keeping my minimum FC level at or above 12 after battling mustard algea. The water is as clear as I've ever seen it and everything is stable but...