WAPI - Water Pasteurization Device

Water Pasteurization Indicator (WAPI) - small tube filled with a soy wax that melts at 149F

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It's a simple thermometer that indicates when water has reached pasteurization temperature and is safe to drink.  I put mine to the test today in the solar oven and it worked! (OK, I knew it would)

Solar oven cold

Water, WAPI and jar cold - note wax is solid                                                

Oven HOT enough to kill bacteria - two hours later (outside temp 52F when we got started and 69F at finish)

Melted but in water - hard to see on screen

Lifted out of the water, wax melted.

Still melted - hung with one end up so the wax will harden to one end (It cools and hardens quickly!)