> It's a custom to boil the water, or use a Turmix Katadyn filter... > Do you know what's inside the filter? Silver granules!---Alex Thanks, Alex, this seems to be a popular product: "List of longterm Katadyn users: International Red Cross, World Health Organization, Armed Forces Switzerland, Germany, USA, Portugal, US Navy Seals, US Forest Service, National Park Service, United Nations, Federal Bureau of Investigation, Drug Enforcement Administration, Swiss Tropical Institute" http://www.katadyn.net/index.shtml jr
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