Well, seems that I am dealing with one of those instances where my CYA was converted into ammonia.
I am helping my folks open their pool in south jersey, and got a reading of 0 cya with my tf-100. Strange because they used nothing but tablets last year. Sooo, after 16 gallons of 10%, and 4 lbs of cya, I still cannot get my Fc to hold above 5, while my cc is between 7-11. Btw, 18000 gallon inground, covered all winter.
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