Wednesday, July 27, 2005

What are WAPIs?

The reusable WAPI (Water Pasteurization Indicator) is a simple, low cost device containing a special soy wax that helps users determine when water has reached pasteurization temperatures. The wax melts at the same temperature as the water is pasteurized.

Disease-causing organisms in water and milk are killed by exposure to heat in a process know as pasteurization. Boiling is often recommended to achieve pasteurization. However, contaminated water and milk can be pasteurized at temperatures well below boiling, saving time and fuel.

Water heated to 149 degrees F (65 degrees C) for a short period of time is free from microbes, including E Coli, Rotaviruses, Giardia and Hepatitis A virus. At 160 degrees F (71 degrees C) milk and foods are pasteurized.

The WAPI can be used successfully over most fuel sources including wood, charcoal and gas. It also works especially well in conjunction with the solar cooker. With good sun, simple solar cookers can pasteurize water for a family at a rate of about one liter of water per hour.


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