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    CYA went down when I added Cyanuric Acid ??

    I have had my pool for about 5 years and have successfully maintained the chemicals until now. On Oct 17, 2021 I had PH = 7.9 TA = 60 CH = 400 CYA = 50 CC = 5 Salt = 3000 I used the troublefreepool calculator and it told me to add 10 cups of Cyanuric Acid and I did. Oct 25, 2021 I had PH = 8.0...