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 provides clean, fresh drinking and cooking water by reducing sediment, unpleasant tastes and odors, chlorine, Giardia and Cryptosporidium cysts, and asbestos (0.5 nominal micron rating). Up to 12-month/1,000-gallon life. NSF International tested and certified.