Advanced undersink water filters help make drinking water safer for your family. With improved taste and greater clarity, you'll find better flavor in foods and beverages when they are made with filtered water. The QuickTwist Carbon Block Undersink Cartridge reduces chlorine, silt, rust and sediment. The undersink cartridge is a self-contained filter only for use with the DuPont Quick Twist Drinking Water Filtration Systems. QuickTwist filter replacements feature an auto shut-off that enables you to change the filter without turning off the cold water line. The filter cartridge filters up to 2,000 gallons of water and lasts up to 6 months.