Protect your home, health, and appliances by sterilizing your water. The Express Water Ultraviolet Sterilizer Bulb removes major contaminants from your water and provides sterilized water for all home uses. The UV light removes up to 99% of biological contaminants like Salmonella, Fungi, Aspergillus, E. Coli, Cysts, Legionella, Microorganisms, Dysentery, Coliform, Giardia, Mold, Cryptosporidium, Algae, other viruses, and other bacteria.