Please go to their site for complete information.
A Water Pasteurization Indicator (WAPI) is a simple thermometer that indicates when water has reached pasteurization temperature and is safe to drink. It was invented by Fred Barrett and Dale Andreatta.
Photo shows a water pasteurization indicator ready to place in a pot of water (left) and after registering water pasteurization temperature (right.)
Pasteurization destroys all microorganisms that cause diseases from drinking contaminated water and milk. A small polycarbonate tube contains a wax that melts when water or milk is heated enough to be pasteurized (65˚C/149˚F). This saves much fuel by eliminating the need to boil water or milk to ensure that the pasteurization temperature has been reached. See also Instructions for building WAPIs.
Since water pasteurizes at temperatures well below the boiling point of water, WAPIs save time when solar pasteurizing, and save fuel when using traditional fuels.
WAPI kits may be purchased so you can make your own or premade WAPI can be purchases for $6.00 at: http://www.solarcookers.org/catalog/waterpasteurizationindicatorwapi-p-42.html?osCsid=a06ca0ad56fdebce58b61999f199921c
or for $8.00 each from http://www.sunoven.com/cart/index.php?main_page=products_all
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