New -Open box, never installed. Keep your pool water crystal clear with this Orvex StarClear C500 Cartridge Pool Filter, designed as a replacement for the Hayward W3C500. Ideal for above-ground pools, small in-ground pools, and luxury spa pools, this high-quality filtration system provides reliable performance and easy maintenance. Keywords: Hayward C500, W3C500, StarClear Pool Filter, Pool Cartridge Filter, 50 Sq Ft Filter, Above Ground Pool Filter, Spa Filter, Swimming Pool Equipment, Replacement Pool Filter, Pool Filtration System.