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    IC20 @ 1% 8 hours a day: way too much chlorine

    I have a 3500 gallon pool/spa (small) and an IC20 SWG. I run it at 1% only on spa mode which runs 8 hours a day and in a week the FC will go from near 0 to off the chart. Turning it off completely brings it back down over time. Is there something wrong with my IC20 or is there some way I can use...