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Thread: Target CYA? and Solar cover impact on FC Loss

  1. Back To Top    #1

    Join Date
    May 2016

    Target CYA? and Solar cover impact on FC Loss

    Pool store tells me my CYA is 30. My tests show it's <30....probably around 20-25. Test done outside on a sunny day with the sun behind me. Reason I know it's at least 20-25 is that at the start of the season it was <30 but solution still turned a bit cloudy. I then added 1 gal of liquid stabilizer, Which pool calc says would raise CYA by 18. I know according to the Chlorine/CYA chart that 20 is not recommended. However I keep my solar cover on pretty much all day unless we are swimming in the pool and my average FC loss is 1.6. On the days we take it off and swim FC loss is 2.2-2.6. Pool gets sun for ~8hrs.

    CYA test is done until dot Completely dissappers right? Am I being a bit to anal about my CYA level? Should I bother about bringing up the CYA level if I typically keep the cover on and reduce FC loss?
    24K, in ground vinyl, Hayward DE 4820, Hayward Super pump, Liquid Chlorine (Stenner pump/tank).

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: Target CYA? and Solar cover impact on FC Loss

    What you are saying is fine. The solar cover does reduce FC loss. As long as you maintain chlorine level according to your CYA level it will be fine. FC/CYA Chart

    Here are some reference pics for the CYA test,
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