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    puzzled about chlorine / CYA ratios, especially for SWG pool

    I have a SWG pool, and have been educating myself about CYA / chlorine ratios. I had not understood the relationship between CYA and chlorine, and have run my pool for the last few years with free chlorine levels of 1-3 ppm, and CYA levels of 20 -50 ppm. The pool water has been fine, with one...
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