We don't do very many concrete pools in my neck of the woods, but here is the spec from the latest commercial job I bid on:
Double Mat of 1/2" rebar horizontally on 16" centers in walls
Double Mat of 3/4" rebar vertically on 12" centers in walls
Double Mat of 3/4" rebar on 12" centers both ways in floor
Needless to say, this is a heck of a lot of rebar and probably a lot more than you need.

Brad