In May of 2010 we installed our new 18' Intex AGP, I had some sand brought in and leveled it and then we put it together. We left it up last winter and everything went well through this summer. The one thing that we didn't like was the pool bottom had developed humps and valleys from the sand not being packed very good. We took the pool down the first part of Sept. and we decided to have a slab installed for the pool, we decided to put the pool back up to get a head start for next year and after getting a couple of inches of water in it I saw some water on the slab so there is a leak somewhere on the bottom, just my luck. Does anyone have any ideas on how to find a leak on the bottom or am I looking at a new liner?