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The SteriPEN looks pretty clever, you pre-filter the water, then dip a UV light in to kill the bugs – $150-ish and it can do over 140 16 ounce water treatments – “SteriPEN 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 protozoa–including Giardia and Cryptosporidium–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….SteriPEN has been shown to destroy in excess of 99.9999% of bacteria, 99.99% of viruses and 99.9% protozoa” [via] – Link.