newbie with pool construction questions

[BigDave]

Is that 2" of soft closed cell polyethylene foam or is it the rigid sheet goods used in home construction? If it is the construction material, is it rated for exposure? It's usually behind sheathing or siding. My experience with rigid construction foam is that it can be crushed and dented which would leave your pool with a memory of all the heavy footfalls.
Have you purchased a circulation / filtration system?

What kind of 12 x 18 pool did you buy? Hard metal sides or soft sides?

Good luck - keeps us posted!

[gch.3]

it is a 12x18x52 metal side pool with a 16" 100lb sand filter with a 1 hp 2600gph pump. the foam i was thinking of using is ridged and is ment for burial under concrete slabs and is rated at 25psi. if there is a better product i am open to suggestions. i am tring to aviod sand as my water table is high and im afraid of the sand washing out.

[BigDave]

Are you burying the pool? Below the groundwater level?