The RenoSys PVC Pool Shell is a 60 mil. reinforced PVC membrane system used to upholster the interior of an existing swimming pool. This system is watertight, low-maintenance and masks virtually any surface imperfection. Perfect for new construction and renovation projects. RenoSys also offers RecDeck Recreational Flooring, DuraTech Pool Gutters and Grating, FuturaPool Modular Public Pools, and a full line of pool and deck equipment. RenoSys.