Hey guys, im going to be installing my above ground pool in the next few months. I live in NE Ohio so climate changes a lot. i suspect one side will be about 18" underground. i thought i would back fill maybe 6 inchs to keep water from going under the pool(happend at my old house and washed the sand out) and then back fill with gravel so the water can flow down and into a drain pipe i will lay around. Does there seem to be an issue with a little dirt to prevent water from going under the pool? should i coat with tar the bottom half? i would love for the pool to last 10-15 years....