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  1. mkass

    Zero CYA. What Level Free Chlorine is Unsafe?

    What is my Free Chlorine target when I have zero CYA ? (More importantly, with zero CYA, how high a Free Chlorine level before it is unsafe for swimmers?) I have an IntelliChlor IC40 controlled by an IntelliChem and IntelliCenter. At Pentair’s recommendation, I keep my CYA at zero. I am...
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