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Thread: Water disappears fast, but stops at a certain level

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    Join Date
    May 2012
    Fort Walton Beach / Florida

    Water disappears fast, but stops at a certain level

    Help please.
    Location North Florida, decent rain
    All through winter there has been relatively low humidity and only mild rain.
    I am doing back yard work so I've only been letting rain fill the pool since dirt and debris gets in it anyway from the yard work.
    All through winter the pool has stayed about half full.
    Once a week I treat the water to keep algae growth away.

    One week ago we had our first big rain. The pool water level rose about 3 inches after the rain.
    And then it dropped back down to the previous level in a matter of days...and then it stopped losing water again. ????
    It's almost as if there is an overflow opening somewhere keeping the pool water level half full.
    Am I supposed to be closing the knob valves somewhere after turning on the filter to prevent overflow loss or something?
    The only openings in the pool are literally the drain at the bottom of the pool (if that leaked then all the water would drain out right?) and the opening for the light in the side of the pool...hmm...which happens to be right at the fixed water level now that I think about it...

    Does that happen? Water leaking out through the lighting fixture??


    1) The size of your pool in gallons ... 20k
    2) The type filter you have (sand, DE, cartridge)... Sand
    3) If your pool is an AG (above ground) or IG (in ground)... IN Ground
    4) If it's IG, tell us if it's vinyl, plaster/pebble, or fiberglass... Some kind of rough cement recently recoated with Olympic Zeron, which is freaking fantastic...algae can't hold onto it very well...I only left the steps the original rough material to avoid slipping.
    In-Ground 15,000 gallon pool
    Sand Filter
    Dead / Humming Pump (Capacitor Rated 161-193 and test revealed 164 on the low side, Contacts all cleaned, still not working)

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Water disappears fast, but stops at a certain level

    Leaking light fixtrues are very common. It's very possible that your leak is the light niche or the conduit leading from it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    Re: Water disappears fast, but stops at a certain level

    A quick way to tell: take the light out of the niche, put some more water in, and squirt a little bit of food coloring inside the light niche. Dye sucked into the conduit = leaking!
    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

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