PVC Swimming Pool with metal frame has triple-layered polyvinyl chloride (PVC) material while rigid pools are made of fiberglass and a PVC liner. The color of the pools is always blue except in some cases where green, yellow, or other colors are used. The frame is made of either PVC pipes or sturdy galvanized steel with a rust and corrosion-resistant coating. The material of the frame is determined by the size of the pool that is the amount of weight it will be holding.