If you have more than a few inches drop, it is a good idea to level off the top side a bit first. |
If the drop is too much, you can get uneven compaction of the sand, leading to a swimming pool that is not level. |
Use small pieces of thin plywood as shown here. Check your supports periodically and gently jack up and slide additional slightly wider thin plywood pieces if needed. Keep wood pieces away from pool liner. |
If you place vertical supports on sand, they will dig in several inches, leading to more bulge at the sides or uneven supports resulting in more stress on some parts of the pool. |
Level the sand, wet down, compact as shown on this page, wet down again, compact again, and to be safe wet down and compact one more time. It is much easier than draining and starting over! |
Uncompacted sand will compact under the pools weight unevenly, leading to a swimming pool that is not level. You then will have to drain the pool and start over! |