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Thread: CYA question

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    CYA question

    I'm sure this is going to be a "duh" question but here goes...

    My CYA has been testing consistently at 80 for a month (TF-100 kit). A few days ago I tested CYA and it was 90. I haven't added any CYA, so my assumption is I just performed a bad test and should just test again, right? It can't go up without adding!
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    Join Date
    Feb 2008
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    Denton, TX
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    5,061

    Re: CYA question

    It won't go up unless you added some. You can get some variance on the test because there is so much left to personal interpretation. Even changing the time of day that you test it can make it look different due to the difference in available light.

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: CYA question

    The CYA test is not especially precise. Two CYA measurements within 10 of each other might as well be the same.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    dmanb2b's Avatar
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    Apr 2009
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    NY
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    Re: CYA question

    Absolutely agree...the other cause could be that perhaps you had some evaporation since your last CYA test...so your CYA concentration may be slightly higher...although if you have an autofil, you can throw that theory out the window

    Anyways, I always view the CYA test as a +/-10ppm measure...cracks me up when someone reports CYA of lets say 47 ...I get all cross eyed everytime I do that test, staring at that darn dot.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: CYA question

    Ha! Thanks everybody. That makes me feel better.
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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