55W Ultraviolet Light Bulbs (55W-UV)"“ Kills harmful Bacteria, E Coli, Viruses Fungi, Algae and most microorganisms including cryptosporidium and giardia, and many other contaminants.Those bulbs are replacement bulbs for Ultraviolet Light Water Purifier Whole House UV Sterilizer 55W, 12 GPMProduct Features:Length: 36"UV lamp: 55WVoltage: 110V & 220VBase: 4 ProngsUV Lamp Life: 9000 hours (about 1 year)IMPROVES QUALITY OF HOME DRINKING WATER "“ with the most advanced Ultraviolet technology, UV water sterilizer system is the most effective disinfection solution for bacteria, virus and germs, for example, E. coli, coliform, Giardia, Salmonella etc. especially for well water, it"™s safe to drink after the purification. Protects your family from waterborne contaminants including microorganismsCHEMICAL-FREE WATER TREATMENT "“ It"™s the UV ray technology adapted to this system, no harmful chemicals need to be added. UV is an environmentally friendly alternative to chlorine disinfection and has no disinfection byproductsPOWERFUL, DEPENDABLE & OPERATIONAL "“ a 12GPM power is powerful enough to sanitize the whole house water, including drinking and cleaning usage. According to the most lab testing results, UV destroys more than 99% of microorganisms effectively. This UV water treatment system continuously works night and day, 24/7, consistently keeping water safe.ECONOMICAL & EFFECTIVE "“ only UV lamp and quartz sleeve would be replaced annually for this UV water purification system, less maintenance cost. It can save a lot money from buying hardware stores, plumbing house, or bottle water. Low electrical needed to save on the energy bill.EASY INSTALLATION & OPERATION "“ it would take you less time on installation as the compact design and simple components. Water flows through the system without need for holding tank or reaction times.