My pool bottom is literally perfect. It is like a sheet of glass. When I asked our Pool builder what would happen if we found a pebble or something after he was done, his response was that it would never happen, that the bottom would be perfectly smooth and it is. Even with the light shining on it, the thing is like glass. We used Bedell Pools in Oceanport.
I watched his men do the bottom and it was like watching craftsmen or artists. They had these wooden pallet kind of things that were covered in really thick foam and they used them to get from place to place.
Here are some pictures of when the man was doing our bottom