This Katadyn® Bottle Adapter encourages hydration by filtering not-so-great water into great-tasting water. Simply attach it to your favorite wide-mouth water bottle (or hydration system with outlet barb) and it works its magic to improve the taste and eliminate water odor. Cartridge will last approx. 200 liters (52.8 gallons). At the end of the cartridge life, simply buy a replacement and continue the great-tasting hydration. Weighs 2 oz.