Unicel 4CH-949 4000 Series 13-1/2 in x 4-15/16 in Pleated Filter Cartridge 50 sq.ft.

Two filter elements may look the same, but do they? There's more to it than meets the eye. The materials used to produce Unicel filter cartridges and d.e. grids are formulated for optimal performance in your swimming pool and spa. Unicel products are constructed to meet exact OEM specifications for proper fit and seal. This is what sets Unicel apart from the rest and has kept Unicel the industry leader for over 60 years. Don't be fooled by imitations. Insist on Unicel!