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Thread: Can't get a CYA number with TF-100 - what am I doing wrong

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    Can't get a CYA number with TF-100 - what am I doing wrong

    New to this method -- and so far the CYA test -- really get no number as I can always see the dot in the tube when full of water to the top. Must be doing something wrong. Pool has cleared up a lot, but still is a bit murky in the deep end. Fearful might have some mustard algae ---
    My numbers tonight - 80 degrees
    PH - 7.5 (I think -- hard for me to differentiate the pink colors!)
    TA - 190
    CH - 180
    TC - 3.5
    Don't know how to test for Borates

    It seems that the CYA or stabilizer is just not registering!


    Jefferson City, MO
    15,000 gal
    Sand Filter
    IG
    Vinyl Liner -- not sure what is behind that - old pool

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    Mod Squad JohnT's Avatar
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    Re: Can't get a CYA number with TF-100 - what am I doing wro

    Do you know that there is CYA in the water?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Can't get a CYA number with TF-100 - what am I doing wro

    Well -- not really. Added about 3lbs of Bioguard Stabilizer 100 a week ago -- left over from last year -- which was never added last year cause the pool co. said it was registering okay and didn't need any.

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    Richard320's Avatar
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    Re: Can't get a CYA number with TF-100 - what am I doing wro

    Aha! We have a clue.
    Quote Originally Posted by allsbp
    Well -- not really. Added about 3lbs of Bioguard Stabilizer 100 a week ago -- left over from last year -- which was never added last year cause the pool co. said it was registering okay and didn't need any.
    3 lbs of CYA in a 15000 gallon pool will raise the level to 24. But the tester won't even measure below 20! It's quite a subjective test, so even if it were all dissolved, there's a chance you wouldn't be able to tell. Also, your pool may be bigger than you think, which would also make it lower than the test can detect. And if you did any backwashing, you might have lost some there.

    If you're going through the shock process, you want to add some more to get it up to about 30. When the process is complete, you'll want to raise it some more.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Can't get a CYA number with TF-100 - what am I doing wro

    Okay -- thanks -- I have only bought stabilizer (bioguard) at the pool store --- do you know if I can get it at Lowes or some place similar? Guess I am trying to avoid the people at the pool store!

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    Re: Can't get a CYA number with TF-100 - what am I doing wro

    You can usually get it at Wal Mart. Read the ingredients on the label. You are looking for cyanuric acid.

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    Richard320's Avatar
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    Re: Can't get a CYA number with TF-100 - what am I doing wro

    Quote Originally Posted by allsbp
    Okay -- thanks -- I have only bought stabilizer (bioguard) at the pool store --- do you know if I can get it at Lowes or some place similar? Guess I am trying to avoid the people at the pool store!
    Lowes has it. I've seen it out with the pool stuff in the garden area. This time of year, lots of places put up displays of pool chemicals.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Can't get a CYA number with TF-100 - what am I doing wro

    Thanks a bunch!! off to shop. Hope everyone is swimming this weekend!

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