Water Purification with Solar Ovens
15:00
38:12
10.8K views
At 15:00 in
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What happens here
The discussion shifts to the utility of solar ovens for water purification. Paul explains that a solar oven can be used to boil water, or more efficiently, to pasteurize it. He demonstrates a 'Water Pasteurization Indicator' (WAPI), a small device containing wax that melts and drops to the bottom once the water reaches pasteurization temperature (above 150°F for 6 minutes). This method kills biological contaminants similar to boiling but requires less energy and time, making it highly effective for purifying water from sources like creeks or ponds after initial filtration with a cheesecloth or T-shirt.
Goal: Explain how solar ovens can purify water.
Tools and materials
- Pots — Containers for water during pasteurization
- Water Pasteurization Indicator — Indicating when water has reached pasteurization temperature
- Cheesecloth or T-shirt — Pre-filtering water
- Water — To be purified