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I have been doing 20% drains and refills to lower my High CYA which started out in the 200s After not testing for a few days I tested the pool 2 days ago and got: PH: 7.3 Chlorine: 1 Total Alkalinity: 60 Calcium hardness: 150 CYA: 75 I was a but surprised to see chlorine so low, since I had it...