SteriPen Adventurer Opti UV Water Purifier
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Lightweight, easy to use to purify your water sources. Will eliminate bacteria, protozoa, and viruses. All you have to do is swish it around in your water for 30 seconds or 1 minute (0.5 liter or 1 liter). There are indicators that let you know when to start and when to stop.
It is good for clearing personal water (.5-1 liter) of bacteria, viruses, and protozoa. Very minimal set up and work. Just place in water bottle or water cup and wait 30 seconds until light indicator turns red.
A great, easy-to-use option that's impervious to freezing conditions.