Baleen Filters 250 sq. ft. Pool Filter Replaces Unicel C-9422, Pleatco , Filbur FC-0830-Pool and Spa Filter Cartridges Model: AK-80007 Media Area 250 sq ft, 10 5/8" OD, Open Hole: 5 15/16" Top, Open Hole: 5 15/16" Bottom, 34" Long, AK-80007 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 250 sq. ft. 9000 Series Cartridge for Jandy CJ 250 Filter, replacement of Unicel C-9422 Baleen Filters Top: Open Hole: 5 15/16" Bottom: Open Hole: 5 15/16" Guaranteed Perfect Fit - Extremely Durable - Wash & Reuse - Most Energy Efficient - Withstands High Pressures & Temperatures Pre-Filters allow for quicker water balancing with fewer chemicals. Washing a filter will extend its life &amp; clean filters use less energy. The Jet Brush makes this quick and easy. Scum Magnets prevent scum andoil from making it to the filter for fewercleanings.