So I'm getting ready to throw down my pool and had some thoughts. I know the pool has to be level and I'm going to do that by throwing down some sand. I'm really worried about puncturing my pool since I am putting the pool down on concrete. So my question is has anybody level with sand and then put down fake grass over it and then put down the tarp that the pool came with? The concrete that I'm putting the pool down is pretty lumpy. Let me know what you guys think. Thanks