Filbur FC-3401 Cartridge, 44sqft, 3"ot, 3"ob, 7", 11-13/16", 3oz, SlvrThis Cartridge is Offered in Another Media Type 4oz Reemay - (17-175-1043) Reemay is Spunbound Polyester made with a continuous filament construction to minimize fiber migration that adds strength and there are no binders to limit filtering area. It is offered in a 3 and 4 ounce media. Look for the "SS" following the Horizon part number for 3oz Reemay cartridges. Please see the Recommended Items for all media type options. Please see Exploded Diagram tab for compatible models.