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FC 7.2, pH 7.6-7.7, TA 90, CYA 50 (CYA from pool store electronic test) I have an algae problem and need to SLAM my pool. Based on the chart Chlorine / CYA Chart - Trouble Free Pool and my CYA level (which I find impossible to test myself as I ALWAYS see the little black dot!), I need to bring...