Hayward W3C9002 Cartridge Filter, Hayward StarClear Plus C9002,Inline,2"fptHayward StarClear Plus single element cartridge filters offer excellent quality, value and convenience No backwashing requirement saves hundreds of gallons of water and money per year Constructed of the most durable materials for the toughest applications and environmental conditions, including in-floor cleaning systems Single locking knob securely fastens head to filter tank, eliminating bolts or clamps Long lasting, extra-large cartridge element with precision engineered core provides maximum flow and efficiency