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Thread: Does high CYA protect swimmers from effects of high chlorine?

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    ned8377's Avatar
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    Does high CYA protect swimmers from effects of high chlorine?

    Since the higher your CYA, the less effective your FC is in fighting algae etc and you need higher chlorine levels if you need to slam does high CYA protect swimmers who may be allergic to chlorine and or may not want their bathing suits faded from high chlorine levels? I have read instructions in the past, on shock products, that indicate not to go into the pool when chlorine is more than 5 ppm. If my CYA was 100 my FC goal would be 5 to 13 ppm but if I had no CYA and had an indoor pool then my FC goal would be 1 to 3. Would both of these scenarios have the same effect on people, bathing suits and vinyl liners? Thanks. Just curious.
    True L 45,000 gal Hayward IG vinyl pool. Hayward Tristar 2.40 THP; 1.5 FRHP/1.60 SF. Hayward Model # S310T2 Sand Filter. Aqua Rite T-15. Aqua Comfort 154,000 BTU Heat Pump. TF-100

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    Re: Does high CYA protect swimmers from effects of high chlorine?

    You are correct.
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    Mod Squad jblizzle's Avatar
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    Re: Does high CYA protect swimmers from effects of high chlorine?

    Take a look at this chart which shows the active chlorine levels. Our recommendations are actually much less harsh than a pool with 0 cya and a FC of 1ppm

    http://richardfalk.home.comcast.net/.../pool/HOCl.htm
    Jason, TFP Moderator
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    Mod Squad pooldv's Avatar
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    Re: Does high CYA protect swimmers from effects of high chlorine?

    Not quite. With no CYA, 3 ppm of FC would be much harsher, very harsh actually, than FC of 39 and CYA at 100. We SLAMed last summer with CYA at 70 and FC at 28 for about 2 weeks. We swam every day and nobody even noticed the difference from the normal FC level of 8ish.
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