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Thread: Questions regarding draining a pool to reduce CYA

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    Questions regarding draining a pool to reduce CYA

    We need to drain our pool to reduce the CYA level. We also have some patches of algae on the sides of the pool. Is it recommended to spray or treat these patches when the pool is drained or will drying and exposure to the sun finish any living algae? Is all the CYA removed with the water that is pumped out or is there a recommended rinse or cleaning procedure for the exposed walls to clean out all the CYA? Thanks!

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Questions regarding draining a pool to reduce CYA

    Welcome to TFP!

    You need to be careful about doing a complete drain of the pool. A vinyl liner doesn't always survive a complete draining and any kind of pool can have serious damage if the ground water level is too high when it is drained.

    If you have a plaster pool, you can rinse the areas that have algae with a dilute bleach mixture to help kill any algae that might be on the walls. Try ten parts of water to one part of bleach.

    You don't need to wash the pool because of CYA. Some small amount of CYA might remain, but washing won't remove it.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: Questions regarding draining a pool to reduce CYA

    Hi PappaBear,

    It would be helpful to have your pool and equipment specs in your sig.
    Go to User Control Panel (upper left under TFP logo), then Profile, then Edit Sig.

    Can we see a pic of your pool?

    Welcome to the forum
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    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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    Join Date
    Jun 2008
    Tucson area, AZ

    Re: Questions regarding draining a pool to reduce CYA

    How high is your CYA level? I mean, if you have 100, and do a total of 1/2 drain (maybe 1/4 at a time?) you'll end up with 50. If you have 200, you'll have to do a 3/4 drain to get to 50, but again maybe not all at one time.

    I wouldn't do a total drain for CYA; just enough to get it down to manageable levels. Too much damage can happen, especially with a high water table.
    Above ground soft side Omega pool
    20 feet diameter, 4 feet deep
    Hayward sand filter
    Hayward 1 HP Matrix pump
    Hayward Aquabug Automatic Pool Cleaner

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