Rather than opting for a brand-new filtration system, we simply swap our used Katadyn cartridge for the BeFree Replacement Cartridge. Replacing this component offers our gravity-powered filters another 1000 liters of life.Replacement cartridge for Katadyn BeFree filtersHollow fiber construction quickly removes sedimentCompatible with most BeFree filtration systemsPurifying Element0.1 micron filterEliminatessedimentsFilterhollow fiberVolume1000LFlowgravityField CleanableyesIncludes1 BeFree Replacement CartridgeDimensions4.3 x 2.2 x 2.2inClaimed Weight1.6ozManufacturer Warranty1 yearActivityhiking