I have an OLD pool, in ground but with a liner. There is no concreate behind the liner, some plywood and dirt! I don't want to keep the pool, and not many pool services service an in ground lined pool. I would like to build a deck, do I have to fill in the pool before I lay a deck over the top of it? If so, do I fill the pool differently than the explainations above? I was told that they have to wait until the ground dries up before breaking it apart, is this true?