So I got a above ground pool put in a few weeks ago. My yard is super unlevel so had it installed so it's perfectly level. They used sand in the bottom of the liner. So it's been about a month now and I noticed some areas you can feel like where there was a tiny rock or some areas you can feel like a like divet like a golf ball size or maybe just big enough for your big toe. Is this all normal. I'm assuming the liners are tough and built to handle all this. My installer said they are good for years.i figured I would ask you guys. I attached 2 pics when they did liner and one of the pool tonight. We are loving pool and kids use it everyday.