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Kim - I saw those links and have been using that chart year round, although I am not sure I understand why TA has an upper limit of 90+. What would be the alarming number if it's way above 90 ? Dave - Thanks for the input, I think that's what I am going to do.

I took a water sample to the local pool store to get it test in preparation for closing and they recommended for closing: lower ph, raise alkalinity, metal free, enzyme, Algae 60. The full report is here: https://1drv.ms/f/s!ApgI-_kKCffcdbmRq1S4DZjIdco Here my own test result FC = 9.5 CC =...