Thank You guys. No I did not put anything down I just layed the liner on the packed sand with a 8 inch sand cove I followed the dirction that came with my pool. I found TFP after my pool had been up awhile wish I would have found this place before I put up pool. I would have put a pad of some kind down if i could redo it I also have alot of foot and heel prints in the sand from when i was installing the liner I didn't know you shouldnt be walking around in there any way seems fine will add a pad of some kind when i replace the liner in 10 years I hope only thing prints do it make it harder to vaccum.