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Thanks for the input. Youa re correct that I mistakenly substituted TC for CC. I've been told by pool "pros" around here that the FC and CC numbers neeed to be the same - that the only thing to worry about is when the CC number is large and the FC number is zero or very small. From what I...

Getting ready to close my pool. Just tested by pool installer. TC is 10.0 (I think their test system will not register above 10.0 but I think TC is above 10), FC is 10.0 (but again I think limited by test system), pH is a 7.7, TA is 165, CH is 300, CYA is 135. Reading the TFP Pool School...