One of the most common reasons we see for Intex pool failures is un-level ground. It's quite important to get the pool very level -- not more than 1 - 2" out of level from side to side.
Sand is a problem. It tends to shift and move, and when you use sand to level under the pool, your pool becomes un-level when the sand shifts. Small amounts of sand, to filling small holes or divots is probably OK. Otherwise, it's not the ideal material for leveling a pool area.
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