Brita On Tap Faucet Water Filter System attaches directly to your tap. This easy and convenient water filter system reduces chlorine taste and odor, lead and asbestos contaminants commonly found in tap water. It also removes 99.99 percent of cryptosporidium and giardia cysts and features an extra layer to trap sediment. With this basic system, one Brita water filter can provide up to 100 gallons of filtered tap water, replacing more than 750 standard, 16 oz. plastic water bottles, which cuts down on waste and saves money. For optimum performance, the filter's indicator tells you when to replace it.