Keep your drinking water clean and safe with the Hydro Guard™ HDG-45 Series Reverse Osmosis System. It reduces the levels of lead, nitrates, cysts (cryptosporidium, giardia), arsenic, sodium, and other contaminants commonly found in unfiltered tap water. The easy-to-install system offers you quality water at your fingertips 24 hours a day, 7 days a week, 365 days per year. Hydro Guard Quick and Easy SM Cartridges make filter changes fast, convenient and sanitary. Your family, friends, and pets will love the taste and enjoy all the benefits of healthy water.