The Culligan® D-40A Level 4 Premium Filtration cartridge reduces bad taste & odor, aesthetic chlorine taste & odor, sediment, lead, asbestos, cysts such as cryptosporidium & giardia, mercury, turbidity, atrazine, lindane, and particulate class 1. 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 6 months or 600 gallons. Cartridge change reminder sticker included.