Quick Answer
To purify contaminated water sources, use techniques such as boiling, water filtration, or disinfection with chlorine or iodine tablets. Boiling water for at least 1 minute at an altitude of 6,562 feet or less is a reliable method. It's essential to use a combination of these methods for optimal purification.
Boiling Water
Boiling water is the most effective method for killing bacteria, viruses, and protozoa. To boil water, fill a pot or container with water from the contaminated source and bring it to a rolling boil. Maintain the boil for at least 1 minute at an altitude of 6,562 feet or less. For higher altitudes, increase the boiling time by 1-2 minutes for every 1,000 feet above 6,562 feet. For example, at 9,000 feet, boil water for at least 3 minutes.
Water Filtration
Water filtration is a reliable method for removing particulate matter, bacteria, and viruses from contaminated water. Use a water filter with a porosity of 0.2 microns or smaller. Some popular water filters for backcountry use include ceramic filters, carbon filters, and hollow-fiber filters. Always follow the manufacturer’s instructions for filter maintenance and replacement.
Disinfection with Chlorine or Iodine Tablets
Disinfection with chlorine or iodine tablets is a convenient and effective method for killing bacteria, viruses, and protozoa. Chlorine tablets typically contain 2-5% sodium hypochlorite, while iodine tablets contain 2-4% elemental iodine. Follow the manufacturer’s instructions for dosage and contact time. For example, add 2 tablets to 1 liter of water and wait 30 minutes before consumption.
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