Universal slim design installs quickly and easily to replace cartridge of Culligan undersink filter Nos.US-550 and US-600 Also fits Culligan Nos.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 h Up to 6-month/600-gallon life NSF International tested and certified.