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Thread: Disappearing water

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    Disappearing water

    We moved into our new house in late September and closed the above ground pool in October. Pumped water level down below the return and covered it with a solid tarp like cover. A few weeks ago I checked the water level when I changed a seal around the return that was worn out and the level was essentially where we left it in October. 2 weeks later today the cover blew partially off in a storm and when I went out to fix it I found the pool water down another 18 inches or more from where it was a few weeks ago. My first thought was it magically sprung a leak? The only other thing I can think of is that we do partially pump the water that had accumulated on top of the pool cover off. Is it possible that there was water exchanging from the pool to on top of the cover and we were pumping water from the pool?!? If so how do we keep from doing that next time?


    Also, the prior owners said they refilled the pool for summer using the well water. Is it going to be possible to still fill it from the well now since it is so low? Probably 18" below the return.
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    JasonLion's Avatar
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    Re: Disappearing water

    You might have a leak in the pool. It isn't all that common, but it does happen.

    It is also possible that you have a leak in the pool cover, which allowed pool water to get on top of the cover, where it was then pumped out. This is still fairly rare, but a bit more likely than a pool leak.

    Finally, it may be that something related to the cover blowing off allowed pool water to get to the cover pump.
    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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    duraleigh's Avatar
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    Re: Disappearing water

    Is it going to be possible to still fill it from the well now since it is so low?
    That depends on your well capacity. Do you know the gpm of your well?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Disappearing water

    I don't kmow gpm of well.

    I have confirmed water is seeping from pool to on top of cover. I was planning on opening the pool in about 3 weeks but am wondering if we could go ahead and take the winter cover off and let rain water help fill the pool over the next few weeks in addition to slow water additions from well. When I added water from well last night I saw an increase in the amount of water on top of the winter cover so I'm not sure how well we will be able to fill it with the cover on.
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    JasonLion's Avatar
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    Re: Disappearing water

    As long as the water is below 50 degrees, removing the cover should be fine. As the water rises above that temperature the odds of getting algae go up quickly. Of course even getting algae is not all that bad, and that is about the only bad thing that might happen with the cover off.
    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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    Re: Disappearing water

    Should I be adding chlorine before we get it up and running?
    13500 gallon AG (24' round), 100 sf cartridge filter, Hayward 1hp pump, pool 10-15 years old with recently replaced liner

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    JasonLion's Avatar
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    Re: Disappearing water

    That depends on the water temperature. If the water is above 50 degrees, or you see any sign of algae, adding some chlorine is a good idea.

    If you add chlorine with the pump off, the best approach is to pour it slowly around the edge of the pool and then brush the pool to mix it in.
    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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