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Ultraviolet irradiation has been used for some time in industrial and home water purification systems, but is new to the portable arena. Meridian Design introduces a portable UV-C purifier that screws onto a standard quart Nalgene bottle. AquaStar kills anything with DNA including protozoa (giardia and cryptosporidium), viruses, and bacteria. The bottle protects the AquaStar from damage and keeps UV-C from eyes. Press a button on the side of the unit for a few seconds and 1 minute later, 1 liter of pure water.
Backpacking Light has a unit to test; results will be published when available.
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