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Thread: Overnight loss question

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    Join Date
    Sep 2015
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    Overnight loss question

    I am SLAMing my spa with a CYA of 40. So I take it up to 16. should I really only expect to lose 1.0 or less overnight?

    At what level can the CYA not protect that level of FC?
    1100 gallon gunite IG spa with vanishing edge and 300 gallon overflow basin. Cartridge filter, hayward variable speed pump, finished 11/15/15, Taylor kit,



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    Mod Squad jblizzle's Avatar
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    Re: Overnight loss question

    That is correct, you should not lose more than 1ppm overnight which would indicate that there is nothing in your water consuming the FC.

    I do not understand your 2nd question.
    Jason, TFP Moderator
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    Re: Overnight loss question

    I understood that after raising the FC to a high enough point you are going to lose FC because the CYA can't protect that much of it. I was just curious what that level was. Or am I just wrong?
    1100 gallon gunite IG spa with vanishing edge and 300 gallon overflow basin. Cartridge filter, hayward variable speed pump, finished 11/15/15, Taylor kit,



  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
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    Re: Overnight loss question

    You will always lose FC to the sun regardless of the CYA level. The CYA level will not protect X ppm of FC. Think of it more like the CYA will protect X % of the FC. The higher the CYA level, the higher the % that is protected from the sun and thus the higher the # ppm of FC protected.

    The higher you raise the FC, while the same % will be protected for a given CYA, you will lose more ppm to the sun.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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