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thanks for the replies. i have a sand filter but i believe its called zeolite the was put in it. Thanks

great site been reading and have learned allot I have a 28'x52" 17500 gal pool is still cloudy after about two weeks of bleach, vacuming and scrubbing tring to keep my FC up to shock level but my test kit won't test that high for chlorine. Her are my last reading(7-3) from the pool store FC...