Insulated Concrete Form pools are the best kept secret in a pool building market that has seen little change in decades. ICF was originally designed for basement and wall construction, and are now being used to construct high-quality, energy-efficient, long-lasting pools. ICF's are a preassembled, stackable block made from EPS foam and high-density plastic that envelop steel reinforced concrete. The walls are constructed by stacking ICF blocks, bracing them with steel, then filling with concrete. The forms create stronger that have equal thickness throughout and the ICF provides R23 insulating values.