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The diluted CYA test shows a result of about 110 (the meniscus of the 25/25/50 mix of tap/pool/R-0013 reads halfway between 50 and 60) I presume CYA got that high through overuse of trichlor pucks. And yes to the chart. That's where I got 40 as the high end of the range I noted about...

Hi everyone. I was hoping I could get a little advice. I had my 6500-7000-gallon above-ground pool balanced where I though was perfect about a month ago. About 3-4 FC, a pH of 7.4, TA around 100, and CYA at 30-40. I went away and left my father in charge for a month, and now I’m battling...