Hello to all. This is my first post.
I am having an 18' oval AG pool installed in a couple of weeks by a local dealer. It will have a sand base and foam cove . I have told by a couple of previous PO's to put styrofoam under the liner and would like your input. The dealer never mentioned if he thought this was a good idea or not. What do you all think?
Thanks!

p.s. I have looked at several past posts about the subject.