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Intex 18x48 sand filter salt system. I followed all of the instruction on backwash rinse and then on for salt. The salt system has only ran 6 hrs/day for a couple of days no CYA added so I had my water tested. FC-0 TC-0 CC-0 ph-7.2 hardness-70ppm alkalinity-0ppm CYA-5ppm Copper-0 So it obvious...