The Culligan® D-10 2-pack Basic Filtration cartridge reduces bad taste & odor aesthetic chlorine taste & odor and sediment. The replacement cartridge fits model US-600A. The cartridge is for point-of-use under-sink applications. The filter is not recommended for use with non-treated well water supplies and is not for point-of-entry whole house applications. The cartridge life is up to 3 months or 250 gallons.