Baleen Filters 60 sq. ft. Pool Filter Replaces Unicel C-6660, Pleatco PJ60-4, Filbur FC-1445-Pool and Spa Filter Cartridges Model: AK-5025 Media Area 60 sq ft, 6 15/16" OD, Open Hole: 3 1/2" Top, Open Hole: 3 1/2" Bottom, 29 3/8" Long, AK-5025 1 Year Warranty - Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 60 sq. ft. Discontinued(Limited Stock) Universal Filter for Jacuzzi CF-60 (Crystal Flow), replacement of Unicel C-6660, Pleatco PJ60-4 Baleen Filters Top: Open Hole: 3 1/2" Bottom: Open Hole: 3 1/2" 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.