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Thread: CYA Reading

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    CYA Reading

    3.5 lbs of CYA finished dissolving in my skimmer yesterday evening. What's the likelihood that I could get an accurate reading if I took a water sample to the pool store this morning?

    Thanks,
    Alan

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    frustratedpoolmom's Avatar
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    Re: CYA Reading

    minimal.
    Assume your level is whatever your target is.
    So if you added enough to reach 30, your level is 30...and adjust FC levels accordingly.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
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    Join Date
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    Blessing, Tx (South of Houston)
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    Re: CYA Reading

    Even if it looks like its dissolved, chances are it isnt, a lot will be in the filter, the rest will just be suspended in the water. After say 5 days or so you should get a accurate reading. Just assume its what you aimed at for now, then retest next week.
    Intex 18' AGP - Intex SWG - 19 inch Sand Dollar Sand Filter - 1HP Pentair Dynamo Pump - 4X20 Solar Panel - Goldline Solar Controller.

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    Re: CYA Reading

    Should I not backwash until I'm confident I've achieved my desired level?

    Thanks,
    Alan

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    Melt In The Sun's Avatar
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    Re: CYA Reading

    Correct. You'll likely flush a bunch of it away.
    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!
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    Butterfly's Avatar
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    Re: CYA Reading

    If you need to add CYA and think you may also need to backwash, it would be better to add it with a sock hanging in front of a return.

    You will still lose some CYA when backwashing, just minimal amount that you would ordinarily lose anytime you backwash.
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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