Fatkid

Your pool must be very level. 2-3-4 inches is much to far off.

The spec for a typical steel wall above ground pool is within 1/2" all the way around. An easy set type pool may be slightly more forgiving but still must be very level all the way around.

You need to remove the sod from the entire pool area, then cut the dirt down until the pool site is perfectly level. The easiest way to check is with a transit but you can make a water level using some clear tubing. A long carpenter level and a straight board can work too. You will also need to set paving stones where each post will set. These need to be flat, level both directions and all set to the same height. A tiller can help to loosen the soil and make it easier to dig. It is much better to cut the high spots down rather than try to fill up the low spots. Filling up the low spots will result in settling unless the correct materials are chosen and compacted very thoroughly. It can be done but is not generally recommended.

The pool will be very heavy and the surface must be properly prepared. If the surface is not flat and level, the walls and posts will try to lean in or out as they try to follow the contour of the ground. With thousands of pounds against them this can lead to failure. The better the surface is prepared, the easier the pool will be to assemble and the longer it will last.
 
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