Baleen Filters 240 sq. ft. Pool Filter Replaces Unicel C-8406, Pleatco , Filbur FC-1974-Pool and Spa Filter Cartridges Model: AK-70012 Media Area 240 sq ft, 8 7/8" OD, Open Hole: 4" Top, Open Hole: 4" Bottom, 39" Long, AK-70012 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 240 sq. ft. 8000 Series Cartridge for Pentair - Purex Filter, replacement of Unicel C-8406 Baleen Filters Top: Open Hole: 4" Bottom: Open Hole: 4" 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.