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Thread: Evaporation - How much is too much?

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    riverheightsnancy's Avatar
    Join Date
    Aug 2007
    Flemington, NJ

    Evaporation - How much is too much?

    Wasn't sure where to put this post...

    Is there any method for determining how much evaporation in 1 day is due to the environment or a small leak? In other words, is there a threshold amount that would lean towards a leak?

    I have a painted concrete pool and I am putting top off water in almost everyday. I do have several surface cracks in the pool, they never seemed to be a problem before (we are needing a restoration, but were waiting for a better economic climate!). This is the first year in the last 4 that I am putting in water practically everyday. To the naked eye, it looks like I am losing at least 1 -2 inches within 24 hours. I will say that we have had a smoking hot summer in NJ this year, so I am uncertain if I am just paranoid. There are no other tell tale signs of a leak: no dirt coming into the filter or pool (indicating a broken line), and no obvious wet spots in the yard (indicating a leak near the surface or outer perimeter of the walls). My pool has been the most balanced this year and the water is clear. Would love some feedback from all the "pros" on this forum.
    1960s Original Sylvan Pool
    @ 30,000 Gallons
    Hayward DE Filter
    2 HP Hayward Pump
    BBB believer!

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    Join Date
    Jul 2009
    Olney, MD

    Re: Evaporation - How much is too much?

    Take a look at this page from the Pool School What you are looking for is commonly known as "the bucket test."

    I think it is fairly safe to assume you have a leak somewhere, 1-2 inches in 24 hours is way more than normal evaporation, the link will point you toward detecting the source.
    20k gal, IG Vinyl, IntelliFlo VF Pump, 60 GPM sand filter, Jandy Aquapure Ei 35, 2 skimmers, one main drain, two returns, Dolphin Diagnostic cleaning robot, Taylor K-2006 test kit

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

    Re: Evaporation - How much is too much?

    I agree; 1 or 2 inches definitely means a leak. The easiest thing to check is to make sure you're not losing water out your backwash line; a bad spider gasket can do that. If you're concerned about the surface cracks, swim down there and squirt some dye, and see if it gets sucked into the crack.
    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
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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Evaporation - How much is too much?

    Anything over 1/2" means there is a leak, otherwise what Melt In The Sun said.
    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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