Easy-change icemaker and refrigerator drinking water system replacement cartridge Level 3 - advanced filtration. Reduces: Bad taste and odor, chlorine taste and odor, sediment, lead, cysts such as cryptosporidium and giardia, turbidity, atrazine, lindane, particulate Class 1. Features: Twist-On, twist-Off mechanism. Quick connect fittings, NSF Certified, 500 gallon filter life. Package includes: Replacement filter cartridge and filter change reminder sticker.