Currently used by the US Military ( National Stock Number NSN 6850-01-352-6129), 30 tablets per box, eliminates Giardia, bacteria, viruses, removes sediment. Each 600 milligram tablet provides 1.4% available chlorine, and enough flocculating agent for the clarification and disinfection of 1 liter of water from polluted sources at temperatures of 77 degrees Fahrenheit. At 41 degrees Fahrenheit two 600 milligram tablets will provide 2.8% available chlorine for the same purpose. Intended for the clarification and disinfection of polluted/suspended water, to make it bacteriological safe for drinking. Recommended for use during US military exercises.