Hello, I recently had a 24’ round above ground pool installed. On the one side the i staller had to level down about 18”. I am left eith an area that about 20’ long by 2’ wide and 18” deep that I need to back fill. I would like to use river jack rocks. I was told dirt wouldnhold too much moisture around that 18” of the pool but was also told that 18” of river jack would put too much weight against the pool. Any one else have this issue or know what to do? Thanks!