Source for bottom sand?

[AquaBill]

The instructions that came with my 21' AG pool said to compact the sand.

[JJ in Tx]

you have to compact the sand otherwise you will have footprints, lumps etc. all over the place. it also helps if the sand is a bit damp prior to putting the liner in, it will help the sand not to move around as much.

[JoshU]

You should also shoot the site with a transit level to ensure that the pool area is level.