Kit includes RC-EZ-4 level 4 replacement filter cartridge, and filter change reminder sticker. Features twist-on, twist-off mechanism, and quick-connect fittings. 500 Gal capacity. NSF certified. Reduces bad taste and odor, chlorine taste and odor, sediment, lead, cysts such as cryptosporidium and giardia, mercury, turbidity, particulate class I, MTBE, chloramines, and VOC.