Abstract: A replacement filter cartridge for a faucet mounted water filter includes a hollow filter body having an open upper portion having an upper annular edge and partially enclosed bottom portion with a fluid egress orifice therein. The upper annular edge includes a series of castellations. A filter element is disposed within the hollow filter body, and a filter element cover is configured to cover and secure the filter element, said filter element cover includes depressions in an outer peripheral edge. The depressions in the outer peripheral edge form openings between the depressions and an inner peripheral surface of the filter body, such that water can flow into the openings, through the filter element, and out of the filter housing through the fluid egress orifice.