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I havew an inground vinyl liner pool that got water behind it from a leak. The walls started to bulge from all the water behind it. I was afraid I would need to drain the pool to fix the problem. But I was told to just use a shop vac and suck it out. What I ended up using was a submersible sump pump, and a garden hose. I ran the water back into the pool, and it seemed to work. You will need to pop off some of the beading to get the draining equipment of choice behind it. It isn't too dificult, and much cheaper than hiring a pro. BUT BEWARE make sure the equipment is out beofre the vinyl is sucked back to the wall, other wise you will need to find a way to remove it a very tight liner against it. (sound like advice from experience?) good luck!

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17y ago
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11y ago

Loss of the backing material. There is a dry sand and cement bed under the liner. this has been eroded.. A leak there is the first thing I would look for. It could also be caused by water washing underneath but the crater shape does not indicate that. there could be a loss of structure behind it because of something like a root rotting away. I would get some one to check for a leak.

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Q: How do you fix a crater under the pool liner?
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