The 2 Stage Vertical Faucet Mount reduces Heavy Metals (Lead and Mercury), Chlorine (taste and odor), Benzene, MTBE and TTHMs to provide clean, healthy, great tasting water. It also makes cooking with filtered water easy, and it"s easy to install. Bypass function makes it easy to quickly switch to unfiltered water when washing dishes. Lasts up to 100 gallons (approximately 2 to 3 months); built-in Automatic Safety Monitor. Filter measures 2-1/4 by 2-1/4 by 4-1/2 inches; mount measures approximately 3 by 5 by 6 inches; 3-year limited warranty.