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Thread: Water evaporation rate?

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    Shpigford's Avatar
    Join Date
    Apr 2011
    Birmingham, AL

    Water evaporation rate?

    I know there are dozens of factors that play in to how much water evaporates from a pool, but ours just seems high.

    On average, it seems we're loosing about 1" per day (that's on non-swimming days, so it's not due to splash-out).

    Various bits of info that may or may not be pertinent:

    • * Water temperature stays around 80-85ºF
      * High air temp is typically mid-90s.
      * Low air temp is typically mid-70s.
      * 22,000 gallon pool
      * Located in Birmingham, AL
    22,000 gallon vinyl in ground with Hayward S244T sand filter and Hayward 3/4 hp Super Pump.

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: Water evaporation rate?

    Fill a bucket with pool water, mark the level and set on the step so it stays the same temperature as your pool. Mark the pool water level also. If they both drop the same amount in a day, it's evaporation. If the pool drops faster, you have a leak.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Water evaporation rate?

    Without a fountain or waterfall, 1/2 inch is about the most evaporation you can have per day. If you are really losing an inch of water a day there is a leak.
    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

    Join Date
    Mar 2010
    South OC, California

    Re: Water evaporation rate?

    I agree, must be a leak. My pool about about 1-2 inches of water loss a day. I just had new plaster and tile done, along with new equipment (pump/filter/skimmer) and its been about 6 days with 90+ heat and I've only lost about 1 to 1.5 inches of water.

    I had water loss at the skimmer, and thru my old plaster which had major blisters popping off.
    32' x 15', 25k gallon gunite IG pool, California Quartz plaster in Tahoe color
    Pentair equip (Intelliflow VS+AU pump, DE filter, IC40 SWG)
    Spa wall removed to make "seating" area

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