Could it be a mole or a vole?

I would see if they get any worse, but as you said, emptying and filling with sand is the only real repair. I dont know about the sheet metal though.

If its from heavy rain, you may need to divert the runoff so it goes around the pool.


I just replaced the liner in my 24' and right before I was putting the liner in I had a few mole /vole trails coming in from the edges (this year I have a big problem with them all over my yard). I put down some repellent pellets, smoothed the sand and put the new liner in.