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Answered 2013-10-28 04:31:17
CratersI think it is simply a packing down of the sand, especially if it wasn't thoroughly packed to begin with. I don't think there is much you can do about it now. I hope you are correctI have the same problem. I did not wet trowel the sand when I installed my liner. But I have noticed something else that may be contributing to the problem. There seems to be a ground squirrel around my pool in the summer. There used to be two, but poison that I placed in the holes that I found has killed at least one. I am thinking of setting some kill traps under the deck area.

Also consider the possibility of a leak, this would also create a void by erosion.

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