Baleen Filters 50 sq. ft. Pool Filter Replaces Unicel C-7350, Pleatco PCD50N, Filbur FC-3963-Pool and Spa Filter Cartridges Model: AK-60033 Media Area 50 sq ft, 7" OD, Semi Circular Handle Top, Open Hole: 2 11/16" Bottom, 10 3/4" Long, AK-60033 Baleen Filters are made from Durable and Efficient USA Made Reemay Fabric - Washable Fabric Extends Your Filter's Life 50 sq. ft. 7000 Series Cartridge for Caldera Spas (new style) Filter, replacement of Unicel C-7350, Pleatco PCD50N Baleen Filters Top: Semi Circular Handle Bottom: Open Hole: 2 11/16" Perfect Fit - Extremely Durable - Wash and Reuse - Most Energy Efficient - Withstands High Pressures and 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.