Hi all, 3 yards on the 15 x 30, 5 for the 18 x 33. You may both have some left over. You want about a 2-3 inch base and 6 inch coves. Remember to pile the sand in the middle area of the pool. No closer than 3 foot from the bottom rail until you have the wall up and secure. Then spread it out.

Best of luck, Dennis