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Thread: Adjusting CYA

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    Adjusting CYA

    I'm needing to increase my CYA from <<20 to 40, maybe 60 since I get full sun all day. I've read that you should allow a week between adjustments to give the CYA time to dissolve. I'm adding the acid by putting the granular acid in a sock and placing one in the skimmer and the other in front of a return. These have been emptied, especially the one in front of the return which occurred in just a few hours. (There's no hole in the sock)

    Seems to me this means the CYA has dissolved and test results are accurate and I can continue my adjustments. Is this the case or is there something I'm missing here that I still need to give this a week to equalize?

    Thanks
    18X36 IG vinyl 22100 gal. 1.0 HP Hayward Pump w/300# Hayward sand filter.

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    duraleigh's Avatar
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    Re: Adjusting CYA

    Dissolved or not, the test results are not reliable until a week has passed.

    If you dosed carefully, you can ASSUME the correct amount of CYA is in there but it still may or may not show on the test.
    Dave S.
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    Mod Squad zea3's Avatar
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    Re: Adjusting CYA

    If you want to add more without testing just add 1/2 as much as you think you need. Much easier to add more if needed later than to partially drain and refill to take away excess CYA.
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    JasonLion's Avatar
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    Re: Adjusting CYA

    The CYA level will not read correctly right away. You should give it the full week before testing again. Otherwise you risk raising the CYA level too high. Raising CYA is fairly easy, lowering CYA is not so easy.

    The CYA hasn't fully dissolved at the point where it is all gone from the sock. Much of it is still in the form of micro-crystals that are small enough to get through the fabric, but haven't fully dissolved yet.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Adjusting CYA

    Good information to know. I will continue adding up to what the Pool Calculator figured and then check next weekend. This should be fine since it was based on a target of 40 and I'm thinking of headed to 60.

    Thanks again.
    18X36 IG vinyl 22100 gal. 1.0 HP Hayward Pump w/300# Hayward sand filter.

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    Mod Squad woodyp's Avatar
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    Re: Adjusting CYA

    You might want to see how your pool "acts" at 40 first. I went from 40 to approximately 60 last year with the pool in full sun and saw no difference in FC loss.
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