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I seem to have an unusual situation with my CYA. At the beginning of this season I used tabs to get my CYA to 50, them switched to liquid chlorine. Few weeks later I checked my CYA and it had dropped to 30, added several more tabs, back to 40, few weeks later dropped again to about 30. Since...

We had an in ground pool installed last year. 22,000 gal, lagoon shape, vinyl, sand filter (2 cups DE), VS pump, Taylor test kit, central NC. Water chemistry and clarity was great last year. This year was great from opening until about a week ago. I have some slight cloudiness in the deep end...