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Hey guys we went on vacation for 18 days and came back to a green pool on 7/27/12. I added: 4 gallons 12% chlorine and tested it an hour later, it was 0 ppm 4 gallons and tested an hour later and it was 1 ppm 4 more gallons and tested an hour later it was 3 ppm and started to look grayish blue...