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Thread: CYA, Chlorine levels, safe to swim?

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    CYA, Chlorine levels, safe to swim?

    Hi,
    I'm new to the forum and still in the learning curve with our above ground pool. Now realize we have the CYA way too high (100+), but I am confused about the chart showing recommended chlorine levels as they relate to CYA levels. Is it safe to swim in the pool when the chlorine levels are above 3.0?
    My pool test kit says no, but if I understand the info on this site correctly the CYA also buffers the chlorine so those high levels shown on the chart are okay for swimming.

    Please clarify.
    Thanks!!!


    27 ft round vinyl above ground @ 20k gallons, sand filter.
    21,400 gallon above ground, vinyl liner, sand filter, pump size?

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    Mod Squad JohnT's Avatar
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    Re: CYA, Chlorine levels, safe to swim?

    Your understanding is correct. You won't notice the chlorine at the recommended levels from the chart due to the effect of the CYA.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    JasonLion's Avatar
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    May 2007
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    Re: CYA, Chlorine levels, safe to swim?

    With CYA at 100, I would swim with FC levels up to 25. Some people would swim even higher. With high CYA the active chlorine level is actually much lower than it is in many indoor public pools, even when the FC level is above 25.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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