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SteriPENâ„¢ is the only portable water purifier that uses ultraviolet (UV) light to destroy waterborne microbes. Whether your source is a woodland brook or an overseas hotel tap, SteriPEN sterilizes clear water by destroying viruses, bacteria and protozoaâ€”including Giardia and Cryptosporidiumâ€”in seconds. Carry a SteriPEN to disinfect water wherever you travel, hike, camp or trek. It’s the fastest route to pure, safe drinking water anywhere.