When your swimming pool filter is in dire need of a new replacement part, look no further than this economical 4-Pack of HAYWARD Replacement Cartridge Elements. These swimming pool replacement parts are specifically designed to pair with the HAYWARD SwimClear in-ground cartridge filter model C4030. These cartridges are precision-engineered, molded and extruded cores that help provide maximum hydraulic efficiency and structural stability. This pack of cartridges is certified to meet NSF's high-quality performance and durability standards, associated with HAYWARD filters. All in all, these replacement parts will help you get the most out of your HAYWARD filter. Offered in an economical 4-pack configuration, the replacement cartridges are able to accommodate multi-cartridge filters. These replacement filter cartridges will provide maximum efficiency, exceptional first pass debris removal and extended durability. Don't settle for subpar swimming pool replacement parts. Instead, use the 4-Pack of HAYWARD Replacement Cartridge Elements for superior performance, value and dependability.