The SteriPEN Adventurer uses Ultraviolet Light to purify water. The UV lamp destroys 99.99% of all viruses, 99.9999% of all bacteria and 99.9% of all protozoa by disrupting the DNA. Without functional DNA, microbes can't reproduce or make you sick. Sounds futuristic right? Major water bottling plants and municipalities have been using this technology for decades. SteriPEN provides a number of reports documenting the effectiveness of this technology.