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Thread: Draining to lower CYA.

  1. Back To Top    #1

    Join Date
    Jun 2014
    Location
    Iowa
    Posts
    17

    Draining to lower CYA.

    My CYA is pretty high (150ish). I want to drain off a bunch of water and refill, but I'm not sure if I can drain to below the skimmers without getting air in the lines and having problems. If I close the valve for the skimmers and backwash water out only coming from the main drain will I be OK? Any problem if I drain to a little below the returns, or should I keep the water level just above the returns?
    Thanks in advance for the advice!
    25,000 gallon inground plaster pool with attached spa. Sand filter.

  2. Back To Top    #2
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,899

    Re: Draining to lower CYA.

    If you can pull from just the main drain, that should work fine. I've emptied my entire pool that way!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Draining to lower CYA.

    Herky,

    +1 what MITS said.

    We are on a roll to get everyone to enter their city and state in their profile. The climate often affects our suggestions. Would you enter yours, please?

    Dave
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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