Hi,
I just finished tearing down a 15 x 30 by 4 ft deep above ground pool; after having it up for the last 24 yrs! No fun!
My wife and I installed it ourselves, and it's really been a lot of fun through the years, until now; we don't use it anymore with the children gone from home.
But, to your question, our pool had many, many pages of installation instructions. The MOST important one was:
The ground MUST be not more than 1/4 inch off level, all the way across, all directions. I actually borrowed a "transit" and a level rod from an engineer friend. I leveled the "level transit", then my daughter (10 yrs old then), held the level rod all around the pool area, taking readings, to be sure all points were within 1/4 inch of each other. Took a lot of time, digging out a little more, and adding some more sand here and there.
I would think that over 1 inch difference would be OK, but not as much as you say. I would "tear it back down", and re-level your ground area.
Since we live in the Appalachain Mountains, I hauled in sand, putting it about 3 inches deep all around the bottom, then tamped it down, before putting the pool cover over it... keeps small rocks from tearing a hole in the pool liner later on. Best of luck.
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