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    CYA rapidly goes to 0ppm

    I have a 34,500 gal pool in FL. I was running a Total Control system with a CC-15 cell that I switched about 1 month ago to percentage & ph due to my ORP control not functioning well. 3 times now I have had 25ppm -40 ppm of CYA rapidly go to 0ppm. Most recently I have been very stable at...