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I teach survival and bushcraft courses, and spend as much time as possible outside, and I have been using water filters in the outdoors since the 1980's, and they have all been "better than none": slow, demanding frequent maintenance and fragile. Finally there is one that is fast, self-cleaning, easy to use and can handle drops and freezing. The fact that it is more capable -- i.e. removes viruses! -- than the old one it replaces it is icing on the cake.
This is my 2:nd MSR Guardian, been around the globe. It´s the best purifier of them all!