Well, don't get me wrong, but ya know, I'm thinking, if I go on an average of 5 to 6 trips a year, I know for a fact that the last four years, at least once, and sometimes twice a year, on a trip, I end up using my Chlorine Dioxide to treat water for someone whose filter has given up the ghost.. In the rockies where I am it's often just due to the rock flour in the glacier fed streams, or sometimes it's just because it's a complicated piece of plastic. Most recently it was even for a fellow forum member..