I want to place a pool on a concrete slab so as to avoid the moles, and ease in the leveling of the area the pool needs to go. I can't find any ref. to how thick I would need to pour the pad. It's an 18X33 pool so the gross weight should be about 150K spread over 600 sq feet or so. that would give me 250 lb per square foot if I calculated correctly. Anybody got some direction for me?