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Could be several things. If your pool walls are sunk into ground instead of setting on the ground, or pool is at base of a slope in the yard, and sand is washing out from under pool floor, it might just be a spot where heavy rains let water flow under pool wall and floor eroding the sand under the liner.

Usually small pin-holes in the liner won't do much if anything to the sand, but if you get a larger hole in the liner, the water leaking out of the pool could also cause erosion of the sand under the liner.

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โˆ™ 2012-06-21 12:58:33
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Q: What causes sand to wash away under an above ground pool?
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We live in a flood zone and traditional above ground pools would be washed away Can you build a concrete pool above ground?

You can but you still have to make sure it is fastened to the ground and it is full at times of flood because they can float and can get washed away if they are not anchored to the ground.


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Ground water causes erosion because the ground water begins to wear away the materials and soil in the ground.


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