The Culligan® D-30A Level 2 Extra Filtration cartridge reduces bad taste & odor and aesthetic chlorine taste & odor, sediment, asbestos, cysts such as cryptosporidium & giardia and turbidity. 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. Cartridge change reminder sticker included.