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Thread: CYA Chlorine Chart

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    Join Date
    May 2016
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    Brandon, MS
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    CYA Chlorine Chart

    Is there an optimal CYA number that results in the clearest water at the lowest cost? For example, is it better to maintain CYA of 30 and the matching FC level, or move CYA to 40 and maintain a FC level that is higher? Is there an advantage either way?

    Thanks!
    Greg - Mississippi
    18' x 36'* 23,000 gallons * Vinyl * Manual Chlorination * Pentair Sand Filter * Pentair Variable Speed Pump * Polaris 360 * TF-100 Test Kit

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    cowboycasey's Avatar
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    Re: CYA Chlorine Chart

    In your neck of the woods it may be better to have your CYA at 40, with that said it depends on how much sun your pool gets all day..

    the advantage is when your pool has more sun the higher CYA keeps more FC protected and it ends up using less chlorine even though the FC is kept higher...

    I hope this helps
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    JoyfulNoise's Avatar
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    Re: CYA Chlorine Chart

    The FC/CYA chart is designed so that the ratio (FC/CYA) is always the same , 7.5% for manual bleach dosing and 5% for SWG pools. So every recommended level has the same active chlorine (hypochlorous acid) concentration. As Cowboy Casey said, you can just pick a CYA level that gives you the lowest daily FC loss from sun light (the biggest component of FC loss). In sunny locations with high heat, higher CYA is usually better.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Join Date
    May 2016
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    Brandon, MS
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    Re: CYA Chlorine Chart

    That answers my question. My pool gets constant sun, so I'm going to stick with 40! Thanks!
    Greg - Mississippi
    18' x 36'* 23,000 gallons * Vinyl * Manual Chlorination * Pentair Sand Filter * Pentair Variable Speed Pump * Polaris 360 * TF-100 Test Kit

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    Mod Squad pooldv's Avatar
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    Re: CYA Chlorine Chart

    If you still use more than you want to feel free to bump it to 50.
    TFP Moderator
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