For over 80 years, Culligan's water filtration systems have improved water quality for thousands of families worldwide. Filters 6 impurities including lead, chlorine taste & odor, and cysts*. Culligan filters reduce chlorine taste & odor for better tasting water and ice. Additionally, most Culligan filters reduce the presence of illness-causing, waterborne parasites, like Giardia and Cryptosporidium, helping you stay healthy when you hydrate. Culligan filters are produced and assembled in the U.S. and provide a compatible refrigerator fit that's easy to install and replace every 6 months. Culligan filters are certified by IAPMO R&T against NSF/ANSI 42 and 53 for the reduction of claims specified in the performance data sheet*. * For complete list of Culligan filters and impurities reduced, see manufacturer's performance data sheet or website for full contaminant reduction information. Substances reduced are not necessarily in all users' water.