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Thread: Removing CYA/Water

  1. Back To Top    #1

    Join Date
    Apr 2007
    Location
    Baton Rouge, La.
    Posts
    75

    Removing CYA/Water

    I need to remove a lot of water from the pool in order to remove CYA..can someone tell me.. If I were to use a pump, How much water can I take out at a time without doing any damage to the fiberglass pool??

    Is there a "chemical" way of doing it??
    Harry
    Trilogy "Fiberglass" Pool,
    15x34 8900 gal.
    Pentair 1hp Super-Flo Pump
    Pentair CC100 Cartridge Filter, Pentair "Legend" Cleaner

  2. Back To Top    #2
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Removing CYA/Water

    If you did about 1/3 down you would be fine, that should bring you down to a more manageable number around 70 if the CYA really is 100....

    drain, refill, circulate for a few hours, retest, repeat if needed.

    The risk for fiberglass is it could pop out of the ground but I think that's if you drain more than 50% or completely....

    From a recent post on the forum there really isn't a practical/useful/efficient chemical method....
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  3. Back To Top    #3
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,887

    Re: Removing CYA/Water

    The main issue with draining is the depth of the water table. You don't want to drain the pool below the water table level. It isn't always easy to find out the exact hight of the water table, but you should have some idea if you live in a wet swampy area or a dry well drained area and you can use that to guess. If you are up on a dry hill and there has been a drought recently you can drain much more water safely than if you live in an area with wet swampy soil and it has just rained.
    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

  4. Back To Top    #4
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Removing CYA/Water

    Thanks for clarifying that. So being Baton Rouge and recent heavy rains, is 1/3 safe enough or should he just stick to skimmer level, and repeat a few times?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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