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Thank you so much for the detailed explanation - so helpful! I really appreciate it!

So no concern with the PH drifting up on a fairly routine basis (assume that is normal due to spa spillover?)? MA isn't super cheap here ($13 for 2 gallon pack) - assuming that's the case in most places or I should shop elsewhere? Can you help me understand what the low CH means or why it is...

So we took over active management of our own pool chemical monitoring using the TF method and TF-100 test kit starting in June of this year. We spent probably a month working to lower the CYA that had climbed up to 80-90. After replacing 1/2 the pool (or more) with some very expensive new...