For over 85 years, Culligan knows every drop of water flowing through your home is important. Should you have any questions regarding the use of your product, you'll enjoy knowledgable and responsive customer service support. Provide your family with visibly clean, great-tasting water for drinking, cooking and more. The Culligan D-40A Premium filtration cartridgelead, giardia, cryptosporidium cysts, lindane, atrazine, asbestos, mercury, sediment, chlorine taste/odor, and chloramines. The replacement cartridge fits model US-600A. The cartridge is for point-of-use under-sink applications. The filter is not for point-of-entry whole house applications. The cartridge life is up to 12 months or 1,000 gallons.