I have a 22ft intex ultra frame pool. My yard is 19" out of level. Instead of digging 50 tons of dirt I am building a box to level up with the high point of the yard. My question is, why cant you use sand to level? will it damage the pool or cause it to collapse? or sink? I posted same question a little bit ago but it never showed up, guess I messed the post up. sorry if it shows up twice.