Love this sharing of information!! I would like to ask about the sand. Is it vital? Recommended? My 32' X 16' X 52" pool will be here in about 7 days. I'm new to this and don't want to make a mistake (your photo's are making me nervous). My uneducated plan is to have someone dig and level the area, then an inch or two of sand, then 3/4" XPS foam board, then the tarp that comes with the pool, then the pool. I'm concerned about staying level when I add the sand. Is the sand necessary?