A filter cartridge which includes a filter medium having a cylindrical segment shape and a channel disposed within the filter medium for receiving fluid filtered through the filter medium. A method of increasing a filter medium surface area of a filter or lowering pressure drop across the filter that has a plurality of filter cartridges disposed in a filter vessel. The method includes removing at least one filter cartridge from the filter vessel and replacing the removed filter cartridge with a filter cartridge that includes a filter medium having a cylindrical segment shape. The latter filter cartridge also includes a channel disposed within the filter medium for receiving fluid filtered through the filter medium.