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Thread: Would this be a good way to test CYA

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    Join Date
    Jul 2013

    Would this be a good way to test CYA

    Would setting the tube on a white surface (white concrete or a printer paper) with my back to the sun be the best way to test it?
    I can't figure out if I have 30 or not. When I hold the tube at the waist level the water is shaking a bit and it looks like I have 30. If I have it sitting on the concrete it's more like 25-27

    I know CYA test is +- 10ppm, but would sitting bottle on the ground be the more accurate testing?
    23k in-ground plaster. Cartridge filter Hayward 450 or 550. Hayward 2ph pump.
    liquid chlorine, tablets occasionally when out of liquid and cya allows it. ph down.
    stabilizer (Had no cya last two openings, but never before that)
    no other chemicals used in years

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    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: Would this be a good way to test CYA

    Holding it at your waist is best. Test needs indirect light from all directions to be accurate. Setting it down eliminates some of that light. Your CYA is 30. I'd consider bumping it up another 10 ppm to be more efficient, cost effective with your chlorine usage.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Mod Squad jblizzle's Avatar
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    May 2010
    Tucson, AZ

    Re: Would this be a good way to test CYA

    When in doubt ... buy the 50ppm standard CYA solution
    Jason, TFP Moderator
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    Mod Squad Patrick_B's Avatar
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    Jun 2011

    Re: Would this be a good way to test CYA

    And, it isn't accuarate eniugh to discern a few PPM. Call it 30 I agree, and adjust accordingly.
    TFP Moderator
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