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Thread: Indoor pool leak

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    Indoor pool leak

    I have an older indoor pool that's been leaking for a while now. At first I thought it was evaporation. It started to leak more back on Feb/March - it'd lose about 0.75" every 24h. At the same time I noticed air in the pump that would not go away. I'd turn the pump off and in a matter of a few months it lost most of the water. So I drained it to about 2 feet of water and it continues to leak. In my view, the only possible leak sources would be the three floor outlets with returns and drains. There are there total - two in the deepest section and one on the opposite side. I have removed and reinstalled the rubber plugs on all three and filled it with about 1ft of water to cover the bottom - it still continues to leak. I've tried pouring water with die around the outlets yet I can't see any water movement indicative of a leak. Is is possible that it's leaking though the concrete, even though there are no visible cracks? Would the pressure test be the next logical step? Thanks.

    - - - Updated - - -

    I was trying to attached are a few pics of the outlets but the system doesn't let me.

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    cowboycasey's Avatar
    Join Date
    Jul 2013
    Fletcher, OK

    Re: Indoor pool leak

    Your at the limit for posting pictures through TFP unless you want to donate..

    Did it stop leaking at a certain level? when it stops that is where the leak is, well just above it
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    Re: Indoor pool leak

    I didn't wait until the leak drained it completely, but it kept leaking past the skimmers. The only obvious (to me) potential leak sources are in the floor of the pool that includes the three floor suction outlets and what it appears to be a hydrostatic pressure valve.

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Indoor pool leak

    That is enough water loss to confirm the leak. especially since it's indoors. The problem is then, "Where is it?"

    Can you let it leak on down until it stops? (that'll be the level of the leak and you should be able to find it from that.)
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Indoor pool leak

    This doesn't make sense to me but it's now been two days and the level of water hasn't dropped and it coincides with the two consecutive warm days this season (75-80F) after several weeks of wet and unseasonably cold weather. As a background, since I've had the pool I noticed that during the winter months I'd be losing significant amounts of water then it would stop when the weather got warmer it would stop. I'd add water and be OK for the most part during the warm months here in PA. In the the early month of this year it looked like I was losing more water than previously though, which prompted my investigation. Now. I'm confused as the leak seems to have stopped. What would be a correlation between indoor pool leak and outside temperatures? My house sits on a sloping hill if that makes any difference.

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    Re: Indoor pool leak

    I'm back with the same problem. It took almost a year for the leak issue to reoccur.
    Out of the blue, ever since the Easter we've started to lose water at the pace of abo 0.75-1" every day.
    The pump had been going and the heat was on as they weather got warmed and we were looking to get back into the pool.
    I turned the pump off about three weeks ago and water continues to leak somewhere.
    Other than plumbing, what are the chances that water is escaping though a crack in the the concrete and is there any way to detect it? There's only one pronounced crack going through the steps but I believe water continues to leak past that crack. The last time around the water kept leaking all the way down to the return valves in the floor. Right now it's about the pool light level, past the skimmers and it continues to leak.
    I may have to run pool pressure test to determine if it's the plumbing.
    Any ideas are greatly appreciated.

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    Mod Squad pooldv's Avatar
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    Aug 2012
    DFW, TX

    Re: Indoor pool leak

    Leaks can be tough to track down. Here is an article from pool school with some tips, Pool School - Leak Detection
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    Re: Indoor pool leak

    I followed the lead from Pool School - Leak Detection which btw is a helpful article.
    I did a test with a food coloring around the return wells and I think I may have found the leak. With the pool half full the test was inconclusive however when after the water was almost gone it was easier to see the tendrils of the color pulled drawn into the rubber plugs in the drain outlets. I have just replaced them so the material is new. What i noticed though is that the drain outlets should have been closed off with threaded plugs with orings instead of the rubber ones. Am I correct or one can use the rubber plugs in threaded outlets? I'm going to try to source them locally this week and replace the rubber ones and test it again.
    Also, there's an old unused return (non-threaded) plugged with a rubber plug (8) which also may be leaking. Do I need to get a better quality plugs or can they be sealed with silicone lube or other material?

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    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: Indoor pool leak

    I think you get a better seal with a threaded plug, but you can use the rubber ones in a threaded outlet. I would get a new rubber plug for the old unused return.
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