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Thread: CYA Going Down

  1. Back To Top    #1

    Join Date
    Jul 2016
    Birmingham, AL

    CYA Going Down

    This is my first year having a pool, and TFP has been a great resource. I initially set my CYA around 50 (in May). Now it is about 30. I have not worried about it too much, but why am I losing that much? I don't think splash-out explains it, because (according to the calculator) I'd have to lose over 13,000 gallons. My estimate is that I could potentially lose that much due to evaporation, but splash-out seems unlikely.
    A sort-of related question. What should I target for CYA? My pool gets sunlight about 90% of the day, so I went toward the high end of the scale.
    20x40 IG Vinyl
    33000 gal.
    Taylor 2006 test kit
    Sand filter
    Aquabot Classic

  2. Back To Top    #2
    Mod Squad
    Join Date
    Aug 2012
    DFW, TX

    Re: CYA Going Down

    50 is the right number before your cya. CYA breaks down 2-3 ppm per month and up to 5 ppm per month when it is hot. That will some splash out and overflow sounds pretty close to where you are.
    TFP Moderator
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