SteriPEN Freedom UV water purifier - REVIEW
The SteriPEN Freedom is intuitive to use, just immerse it in a glass or the mouth of a bottle full of 0.5 litres of water (don’t use it with juice or soda) until the sensors touch liquid. The UV light will automatically come on and then you gently stir until the green LED light stops blinking and turns solid. For a full 1.0 litre of water, do this twice. (Note: you can’t use the SteriPEN with small-mouth water bottles because the openings aren’t wide enough to allow you to immerse it. You need an opening of at least 3.8 cm.) The SteriPEN Freedom is also tiny! There’s no excuse not to take it anywhere because it weighs less than the change in your pocket. Mostly I’ve used the pen for weekend trips into the backcountry and the charge has held up no problem.
Read the full review in our Off-Season Gear Review section.