We have had a ton of rain lately and it has caused some sand to be washed away from under my pool right at the edge. It is an old pool and was already installed here at the house when I moved in. Can I dig down and force some more sand in the void to reduce the crater in the pool liner? I really don't want to drain the pool to fix it. I just opened it up a few weeks ago and the water bill will be huge if I drain and refill again.