Hayward C500 StarClear Cartridge Pool Filter, 50 Square Foot High-quality, reinforced polyester elements provide maximum filtration area and easily trap dirt and debris. Precision-engineered extruded core design provides maximum water flow while reducing energy cost. Consistent with Hayward high quality and compatible with all Hayward specified chemicals. Individually packaged with the Hayward name on end caps and plastic wrap to identify as genuine Hayward parts. Diversified sizes to meet both above-ground or in-ground cartridge filter applications.