Baleen Filters 50 sq. ft. Pool Filter Replaces Unicel C-4950, Pleatco PRB50-IN, Filbur FC-2390-Pool and Spa Filter Cartridges Model: AK-3049 Replacement Filter Cartridge for Unicel C-4950-2, Filbur FC-2390 and Pleatco PRB50-IN Replaces Pleatco PRB50-IN Replaces Filbur FC-2390