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Thread: Taylor CY test vs Pool Store CY test

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    Taylor CY test vs Pool Store CY test

    Hello All.. I am new and this is a first post for me. I have new plaster and am really trying to get the water right. I have taken water to the local pool store three times since filling last week. First trip the CY was 0.. great. New plaster seems correct. In a 17,000 gallon pool I added 2.25 lbs of Cyanuric acid. Back to the pool store 3 days later and the CY reading was 15. Seems about right? I didn't add any more Cyanuric acid and 3 days later they say the CY is 40. I tested it at home with the Taylor kit and when the small viewer was completely full.. which indicates less than 30 ppm.. the black dot is plain as day. The solution is even a little cloudy. Probably closer to the 15. This test is not had to do. I am using liquid chlorine and am losing chlorine on this sunny day. It seems that the 15 makes more sense than 40. I guess I need to try another pool store or believe the Taylor kit? Your thoughts and advice is appreciated.
    17,000 gallon gunite in ground pool, white traditional plaster
    1 HP Hayward Super II, 48 SQFT Hayward diatomaceous earth filter, Sta Rite Max-E-Therm Heater 333btu
    Rainbow Chlorinator (on vacation only), Polaris 380, Hayward Colorlogic 4.0 led, Poolmiser Auto-fill

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    Melt In The Sun's Avatar
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    Oct 2009
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    Tucson, AZ
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    Re: Taylor CY test vs Pool Store CY test

    Believe the Taylor kit! Pool store test results are commonly wrong, but they seem to be especially bad at testing CYA.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,887

    Re: Taylor CY test vs Pool Store CY test

    Definitely believe the Taylor kit.

    When you add more CYA, wait a week before testing the CYA level again. It can take several days to a week for the CYA to fully dissolve and show up on the test.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Taylor CY test vs Pool Store CY test

    Thank you for the quick response. I will only listen to you guys and Taylor! :cheers:
    17,000 gallon gunite in ground pool, white traditional plaster
    1 HP Hayward Super II, 48 SQFT Hayward diatomaceous earth filter, Sta Rite Max-E-Therm Heater 333btu
    Rainbow Chlorinator (on vacation only), Polaris 380, Hayward Colorlogic 4.0 led, Poolmiser Auto-fill

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