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The Water Pasteurization Indicator (WAPI) capsule contains a special wax that melts at 65 degrees Celsius--sufficient to pasteurize water by killing disease-causing organisms including E. coli, rotaviruses, Giardia and the Hepatitis A virus. The WAPI now has the added benefit of a tough stainless steel cable and brass end caps, which allows it to be used over a campfire as well as in a solar cooker. The WAPI is especially valuable when camping or in situations where solar cooking is not an option. Reusable.