Pro Series high-rate sand filters are the very latest in pool filter technology. Molded of durable, corrosion-proof polymeric material, Pro Series filters feature an advanced, self-cleaning lateral under drain system for smooth, efficient flow and totally balanced backwashing. For crystal clear water with minimal care, pool professionals choose Pro Series. Application: * In-ground pools of all types and sizes * In-ground spas (residential or commercial) * Water features (fish ponds, fountains, water gardens)