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Background - new house/pool so trying to get a handle on chemistry. been here 3 months. Current testing 35,000 pool FC - 4.9 TC - 4.9 PH - 7.9 TA 84 CH - 216 CA - 34 (it just rained like heck for 3 days so its a little low) Phosphates 2100 Was as high as 2900ppb I have tried two different...