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Thanks for your responses! I suspect "testing error" accounts for the change in CH--I got a reading of 200 this morning. It *has* scaling issues and if I was going to be here long term, I think that actively trying to lower the TA would be worth it. As it is...I'm inclined to go with using...

Pool was recently refilled with (very hard) well water (long story). When I got back last week, “pool guy” said he “balanced and conditioned” it. I checked the chemistry Friday morning & got these numbers: TA 220 CH 170 PH: 7.6 FC 3.5 CC 0 CYA: <20 I’ve been checking it daily & adding liquid...