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Thread: Add more CYA or wait?

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    Join Date
    May 2009
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    East TN
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    Add more CYA or wait?

    After my Baq-to-Chlorine conversion a couple of weeks ago, I used the pool calculator to add enough CYA to bring it up to 40. I tested after 5 days and got a reading of 30 using the TF test kit. So I used the calculator again to add enough to 40 and tested just now and got 30 still, it's been 5 days again, shouldn't it go up by now? I'm afraid to add more. Should I give it a few more days and test again?

    oh, here's my test results. My daily chlorine use has been pretty consistent at around 2 ppm each day this week. Not bad since we've been in it several times this week and had guests over last night, not to mention the sunny days we've had.

    FC 2.5 (will top up to 4 tonight which is the recommended level for my CYA, as per the chart)
    CC 0
    pH 7.3
    TA 120
    CYA 30
    Jennifer
    24 ft. AG-approx 13,500 gal
    2 HP sand filter-2 speed
    4ft x 20ft Sunheater Solar Panels

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: Add more CYA or wait?

    Five days should be long enough. We say a week just to be sure we catch the extreme, and rather rare, cases (very cold water, low flow rates, etc).
    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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    duraleigh's Avatar
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    Sebring, Florida
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    Re: Add more CYA or wait?

    Did you add (40ppm + 10ppm) or did you add (40ppm + 40ppm).

    I think you are saying 40 + 10. If so, wait a couple more days, test, and if still 30, then add enough for 10ppm more.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4

    Join Date
    May 2009
    Location
    East TN
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    Re: Add more CYA or wait?

    Quote Originally Posted by duraleigh
    Did you add (40ppm + 10ppm) or did you add (40ppm + 40ppm).

    I think you are saying 40 + 10. If so, wait a couple more days, test, and if still 30, then add enough for 10ppm more.
    Yep, 40 + 10. Ok, will test in a few more days.

    Thanks.
    Jennifer
    24 ft. AG-approx 13,500 gal
    2 HP sand filter-2 speed
    4ft x 20ft Sunheater Solar Panels

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