Culligan Replacement Cartridge For IC and US-Series, Level 1 -Basic Filtration: * Easy-Change replacement filter for IC-EZ-1 and US-EZ-1 * Level 1: Basic Filtration * Removes bad taste and odor, aesthetic chlorine taste and odor from water * Particulate Class III * Twist-on, twist-off mechanism * Quick-connect fittings * Cartridge life: 3,000 gallons * Includes manufacturer"s 2-year limited warranty * Model# RC-EZ-1