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My water looks great, no algae, but I have been getting some white calcium scaling on my tile. Please help. FC 4.5 CC 4.5 CH 300 PH 7.7 TA 90 CYA 65-75

My pool was finished in October of 2015, for the past 16 months I have been using chlorine tabs and other chlorine shock treatments that have sky-rocketed my CYA levels. I have not had any major problems. Water has always been blue. (just some small algae blooms that brushed off the pebble...