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Thread: Latest chem tests; CYA went down?

  1. Back To Top    #1

    Join Date
    Aug 2016
    Location
    Dallas, TX
    Posts
    141

    Latest chem tests; CYA went down?

    Just did my weekly full chem test, and my CYA went down. I thought it was very hard to get CYA out of the water, without removing water...is that not the case?

    FC: 4.5
    CC: 0.0
    pH: 8.0
    TA: 60
    CH 340
    CYA: between 40 and 50.

    pH crept up because I had to add salt yesterday, and left the spa spillway on to help agitate the water. Probably not needed, but that's OK.

    I'll treat all accordingly per pool math, just curious if the CYA decrease is normal. EDIT Does it go down with evaporation, or does it act like salt and never leave unless water is removed?

    Thanks

  2. Back To Top    #2

    Join Date
    Aug 2016
    Location
    Dallas, TX
    Posts
    141

    Re: Latest chem tests; CYA went down?

    I am going to answer my own question... My bad, we just had a baby and I'm sleep deprived.

    While at the hospital for the delivery the auto fill got stuck filling. Surely it displaced enough water to lower the CYA.

    Not even sure who turned it back on, but I HATE it. Just permanently discnnected it.

  3. Back To Top    #3

    Join Date
    Jun 2011
    Location
    Long Beach, CA
    Posts
    2,670

    Re: Latest chem tests; CYA went down?

    CYA will slowly drop throughout the year and will need to be topped off every now and then. In your case, lesson learned.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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