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Thread: CYA /

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    CYA /

    above ground pool. Direct sunlight ALL day. NO shade at all. should I keep the CYA about 40? seems im losing a lot of chlorine every day? thanks
    Above ground 24ft round 54 in deep 1hp 2speed Hayward power flo matrix pump& sand filter.

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    Mod Squad JVTrain's Avatar
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    Re: CYA /

    What is "a lot"? 4 ppm? 10 ppm? 15 ppm?

    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Mod Squad woodyp's Avatar
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    Re: CYA /

    40 is a good place to start. Then you can bump to 50 no probs and see if you gt any savings over chlorine loss.
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    Re: CYA /

    well, trying to keep it about 5. and usually its gone or down to maybe 1 by the end of the day. is that normal?
    Above ground 24ft round 54 in deep 1hp 2speed Hayward power flo matrix pump& sand filter.

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    Mod Squad JVTrain's Avatar
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    Re: CYA /

    That does seem like a lot even for direct sun at 40 CYA. What is your pool temp?

    I would bump your FC up targeting 6 or so tonight. Test after it's circulated for 30 minutes, then test early tomorrow morning. Overnight chlorine lost test (OCLT). You should not lose more than 1 ppm overnight. If you pass that, I'd go up to 50 CYA and see if that helps.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Mod Squad jblizzle's Avatar
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    Re: CYA /

    You are letting the FC get too low ... you need to stay ABOVE the minimum at all times. See the FC/CYA Chart. Now that the FC has dropped too low, something could certainly be growing in the water making the FC drop more.
    Jason, TFP Moderator
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