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Thread: When to retest CYA

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    Join Date
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    When to retest CYA

    Just completed first fill on new pool so CYA was obviously zero. I added in the recommended CYA levels in a sock and let it hang in front of the water return jet overnight. My question is how long so I wait until I would be able to get an accurate CYA test result. I believe I read in pool school that CYA can take a while after adding to show up.??
    24' Round Above Ground - 13,500 gal, Cartridge Filter, Installed on 5-7-14, First Time Pool Owner! TFP True Believer!

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    ship of fools's Avatar
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    Re: When to retest CYA

    Quote Originally Posted by IcemanVA View Post
    Just completed first fill on new pool so CYA was obviously zero. I added in the recommended CYA levels in a sock and let it hang in front of the water return jet overnight. My question is how long so I wait until I would be able to get an accurate CYA test result. I believe I read in pool school that CYA can take a while after adding to show up.??
    Rule of thumb is assume it is where it should be based on what you added and maintain your chlorine levels accordingly but wait one week to test.
    21,000 gallon inground
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    Re: When to retest CYA

    Pretty much what I was assuming. Thanks for the confirmation!
    24' Round Above Ground - 13,500 gal, Cartridge Filter, Installed on 5-7-14, First Time Pool Owner! TFP True Believer!

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    BoDarville's Avatar
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    Re: When to retest CYA

    I would wait about 7 days from the date you first placed the CYA-laden sock into the water in front of a return jet. Give the sock a good squeeze every now and then to speed up the dissolving process. The longer you run the pump will also speed dissolving. Although the granules should be completely dissolved well before the 7 days are up, I refer to give a little extra time before testing to guard against overshooting your target CYA. If you test too soon, your test results run the risk of getting a low test result which may cause you to add more CYA and wind up overshooting your target. Like adding salt to a recipe, it is much easier to add more than it is to remove/ dilute it if you add too much.
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