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Please tell me what I need to do to my pool to make it safe to swim in and also what I need to do to help me keep chlorine in my pool. These are my water results from yesterday: FC: .05 TC: .19 PH: 7.5 Alkalinity: 67 CH(Hardness): 173 CYA: 40 Phosphates: 0 Copper: .4 Iron: .1 All season I have...