The flavor of a cup of coffee depends as much upon the quality of the water used for brewing as the beans themselves. The Fresh "n Brew Coffee Flavor Guard removes the chlorine that imparts a disagreeable odor and taste to the tap water in your automatic coffee maker, enabling the full, rich flavor of your favorite blend to come out. Proven effective in laboratory tests, the Fresh "n Brew Coffee Flavor Guard allows your coffee maker to achieve optimum performance and your ground beans to achieve their full flavor potential, for the perfect cup of java every time. Ideal for home and office, the Fresh "n Brew is easy to use. Just drop into the water reservoir of your coffee maker, then brew as usual to experience smooth, great tasting coffee for up to 90 days or 100 pots before replacing.