Monday, July 25, 2005

Directions- How to use a WAPI

Using solar energy to pasteurize water


1. Pour water into a black pot or jar.
Thin metal pots are ideal. If necessary, pots and lids may be painted black on the outside, with flat, nontoxic latex paint. Glass jars, painted black on the outside, also work well. Lids should have a small hole in them or be loosely screwed on to release steam pressure. Tip: Place a vertical strip of tape on the jar before painting, then remove the tape leaving a space through which to view the WAPI

2. Place a WAPI, washer down and wax up, into the water with the end of the string outside of the pot or jar. The washer end of the WAPI should rest on the bottom of the pot or jar and the wax end should be higher. Replace the lid.

3. Orient the solar cooker as you would for cooking. In general, face your cooker easterly in the morning and westerly in the afternoon.

4. Set the pot or jar in the solar cooker. If using a panel-type solar cooker, such as the CooKit, you can speed the pasteurization by placing the pot or jar inside a clear, heat resistant plastic bag. Though a plastic bag is required for cooking in this type of cooker, it is often not necessary for pasteurizing.

5. Leave the cooker in a sunny place for a number of hours, reorienting if necessary. Allow at least one hour per liter of water.

6. When the WAPI wax melts and falls to the bottom of the WAPI, the water has been pasteurized. Even if the water has cooled by the time you check it, as long as the wax is at the bottom of the WAPI then pasteurization has occurred.

7. Allow the water to cool before drinking.

8. Keep the water covered until use to prevent recontamination.
Don’t let fingers or unclean objects touch clean water.

If you aren’t sure, re-pasteurize the water.


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