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Thread: CYA test

  1. Back To Top    #1

    Join Date
    Mar 2009
    Indianapolis, IN

    CYA test

    We just opened our pool today and took a sample to Leslies for the fun of it and because I was pretty sure we needed stabilizer. I test at home using a Taylor kit so I generally trust my own numbers. How accurate is a pool store with CYA levels? She read it at 50 so I tested it when I got home and at 30 I could still see the black dot. Is the dot suppose to be totally gone to then read the level? Also she gave me a FC reading of 5 where I get 20 at home! The pool company shocked our pool so I tend to think she is way off!
    18x36 ft
    19,000 gal IG vinyl
    Sand filter Tagelus 24"
    1HP Whisper Flo Pump

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: CYA test

    Could you see what she used to test FC with? If it was the block tester that has chlorine on one side and pH on the other and you have to match the colors to read, it will only test up to 5ppm. Pool stores often use strips to test CYA. Strips will not give a precise result and often are inaccurate. I would trust your Taylor kit.
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  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: CYA test

    Pool stores are very frequently way off. There are some great pool stores for testing out there, but many of them are very unreliable.

    Yes, the black dot should be completely gone, no hint that it was ever there. The black dot CYA test does have it's challenges, but it is still the best CYA test out there.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  4. Back To Top    #4

    Join Date
    Feb 2008
    Flower Mound, TX

    Re: CYA test

    I would trust your numbers over that of the pool store.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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