A shower filter assembly includes a manifold having an external inlet and outlet, and internal inlet, and an internal inlet and outlet. The external outlet is fluidly connectable to the showerhead. An internal flowpath extends between the internal inlet and the external outlet. A manifold collar extends around the internal outlet and the internal inlet. A filter cartridge is engageable with the manifold, and includes a housing having a filter inlet and outlet. The filter inlet is placeable in fluid communication with the internal outlet on the manifold, and the filter outlet is placeable in fluid communication with the internal inlet on the manifold. The housing is sized to at least partially extend beyond the manifold collar when the housing is connected to the manifold. The filter cartridge has a flowpath from the filter inlet, through a filtration element, and then through the filter outlet.