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Thread: Partial pool drain

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    Partial pool drain

    I'm panning on doing a few partial drains (1-2'each time) and refill to get my cya way down. It's at well over 100 (probably 200). At what point in my refilling should I test and be at a managable level. What would a good cya level be?
    Kris
    In ground 26,000 gal. 16x36 Avg depth-6'
    Vinyl
    sand filter used 24/7
    auto cover
    Elgin/Illinois

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Partial pool drain

    I suggest you aim for a CYA level of between 50 and 60, though levels up to 80 are manageable.
    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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    Join Date
    Apr 2011
    Location
    Lynchburg VA
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    393

    Re: Partial pool drain

    My pool is about the same size as yours and I went through a similar process last year when my CYA was in the 200 range also. I drained the pool down to where there was about 9-10" of water remaining the the shallow end and then refilled it. I ended up have to do this twice to get my CYA correct. It is important to make sure that amount of water remains in the shallow end to keep the liner in place. I keep my CYA at about 55.
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    Re: Partial pool drain

    thanks for the response-when you did this last year, would you say you lowered it about 2 feet each drain? I worried about my liner-did you have water brought in-I'm on a well so that's what I'll have to do.
    Kris
    In ground 26,000 gal. 16x36 Avg depth-6'
    Vinyl
    sand filter used 24/7
    auto cover
    Elgin/Illinois

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