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Hi, It feels like we've had this problem forever. Each time I take my water in to get tested it shows ZERO chlorine. These were our numbers today: our pool is roughly 12,000g, salt, hayward system FC 0 TC 0 Salt 2900 Calcium Hardness 500 CA 60 TA 120 pH 8.0 Acid Demand 3 Copper 0 Iron 0...