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Thread: CYA Confused

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    CYA Confused

    I cant seem to get my CYA up.. Its been 14 for 2 weeks.. It did rain a small amount . But seems strange. Have added 8 lbs of CYA stuff in 2 weeks an it wont come up. I got it from the pool store. Poured it in the basket as they told me to do, What am i missing..
    33x52 AGP 25600 Sand filter 1.5 HP Hayward

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    maxepr1's Avatar
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    Re: CYA Confused

    Who is doing your testing? And what kind of test kit are they using?
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE Inteliflo VS 2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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    Re: CYA Confused

    Quote Originally Posted by maxepr1
    Who is doing your testing? And what kind of test kit are they using?
    had it tested at the pool store one time. Im doing the testing with the kit I got here. TF100. Even got new regents to make sure my old one wasnt an issuse.
    33x52 AGP 25600 Sand filter 1.5 HP Hayward

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    Re: CYA Confused

    Did you happen to backwash after you poured the CYA into the skimmer?

    What did the pool store get when they tested?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA Confused

    Quote Originally Posted by duraleigh
    Did you happen to backwash after you poured the CYA into the skimmer?

    What did the pool store get when they tested?

    They said 14 havnt backwashed it in 2 weeks did it today. First time.

    Here is my numbers for my night time test.
    fc 2
    cc .5 barely
    TC 2.5
    PH 7.5
    TA 130
    CYA Im guessing still 14 I can still see dot a 20 an top of tube. A bit cloudy but dot still there..
    33x52 AGP 25600 Sand filter 1.5 HP Hayward

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    JasonLion's Avatar
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    Re: CYA Confused

    Has it been at least a week since your last CYA addition? If not, wait till it has been a full week since the last addition. Assuming it has been a week, 8 lbs of CYA/conditioner/stabilizer should have raised CYA to 37, so it sounds like a little more than half of your CYA vanished somewhere along the line. It is worth double checking the packaging, if you still have it, to make sure it was 95+% cyanuric acid. I've heard of 50% cyanuric acid being sold some places.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: CYA Confused

    Quote Originally Posted by JasonLion
    Has it been at least a week since your last CYA addition? If not, wait till it has been a full week since the last addition. Assuming it has been a week, 8 lbs of CYA/conditioner/stabilizer should have raised CYA to 37, so it sounds like a little more than half of your CYA vanished somewhere along the line. It is worth double checking the packaging, if you still have it, to make sure it was 95+% cyanuric acid. I've heard of 50% cyanuric acid being sold some places.

    yes its been a week.. an the package says 100%
    33x52 AGP 25600 Sand filter 1.5 HP Hayward

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    Re: CYA Confused

    Its been 14 for 2 weeks
    One week or two weeks? If it's two weeks, you need to add some. If it's a week or less, give it another few days and then test.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA Confused

    added 4 lbs 1st week waited a week an added 4 more.. will be end of 2ed week monday.
    33x52 AGP 25600 Sand filter 1.5 HP Hayward

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    Re: CYA Confused

    Keep in mind also that if you backwash, you are going to lose CYA down the drain. Backwash your filter fairly soon after adding CYA and you could lose almost all of it. Rule of thumb is not to backwash for at least a week after adding CYA to give it enough time to dissolve into solution. It dissolves pretty slowly.

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