The Culligan® D-20A Level 1 Basic Filtration cartridge reduces bad taste & odor and aesthetic chlorine taste & odor. 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. Use With #US-600A TV# 563429 & #US-560.