Don t run the risk of having your outdoor swimming pool not functioning properly. To ensure things go as planned use the Pentair R173217 200 Square Feet Cartridge Element for Pool and Spa Filters. This cartridge element is designed for use with the Pentair Clean & Clear above ground pool and spa filters and can also fit the Pentair Clean & Clear/Predator pool and spa cartridge filter. It comes with 200 square feet and measures 11 x 11 x 29 inches. Get the most out of your swimming pool by using the Pentair R173217 200 Square Feet Cartridge Element for Pool and Spa Filters.