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while i was waiting (thanks for the quick reply!), i ran a quick test: I took two cups of water in a bowl. I used that bowl and a clean rag to scrub about 20 square feet of sidewall. at the end, the water was DIRRR-TY. but i dipped two brands of test strip and both registered 0 (I have the...

I have been dealing with a mistake I made last year. The shock powder, which i thought was Cal-Hypo, was Di-chlor powder. As a result, my CYA shot to 169 (I wasn't using pucks, so i thought, why bother checking CYA?) All other numbers are great (FC 4.5-6, ph 7.5, TA 140 (but take off 20 for the...