Universal slim design installs quickly and easily to replace cartridge of Culligan undersink filter #US-550 and US-600. Also fits Culligan #US-560 and CTR-210. Activated carbon block with lead reduction material provides clean, fresh drinking and cooking water by reducing sediment, unpleasant tastes and odors, chlorine, Giardia and Cryptosporidium cysts, asbestos, lead, mercury, Lindane pesticide and Atrazine herbicide (0.5 nominal micron rating). Up to 6 month/600 gal life. NSF International tested and certified.