We have purchased a 9 x 18' Intex pool, and our only real option for placement is where 3 big trees once where. We built a 16 x 24' box and were off level about 4 inches. No big deal UNTIL we started to dig down the high side and encountered a massive root system. We have worked our tails off to remove the roots(not fun at all). We have FINALLY got the ground level with the bottom edge of our box so now we are on to building our base. We live in Florida and have naturally very sandy, shifty soil as well as daily down pours in the summer. I want to make sure this base is sturdy! I have 4 inches of box to fill so I am thinking of using 3 inches of either asphalt millings, or limerock screenings with an inch of mason sand on top for cushion. I will rent a vibrating compactor as well to make sure everything is settled nicely. Has anyone ever used either of these base materials? What was your experience? Pros/cons? Other recommendations? Thanks for reading!