I set my Intex Ultra Frame pool (18' x 52") on a concrete pad in my yard. It seemed pretty level to me and I screwed up by not doing my due diligence and doing some more measuring. I set the pool up and it ended up being uneven by a couple inches, so I'm draining it to start over. Does anyone have a recommendation when it comes to leveling on concrete? I've read some places that sand isn't recommended for frame pools, but is there a safe way to do it? Is there a better method for this? Or is it just a bad idea altogether to try to put a frame pool on a slightly uneven concrete pad?