Prep For Shtf website shares the boiling times and temperatures for safe drinking water by disinfection. As much as stream water often looks perfectly clean, most of us would probably boil it before drinking it just to be safe. Boiling the water kills microorganisms such as bacteria, viruses, or protozoans that can cause disease. Boiling makes the tap water microbiologically safe.
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http://prepforshtf.com/boiling-times-safe-drinking-water/#.UdhrjldsBcw