Using a 50 gallon plastic drum filled with rocks, gravel, charcoal, and sand to purify water for drinking. The filter can be made inexpensively with locally available materials.
Slow Sand Filter
The local water supply in many towns of Mexico (and the world) is not safe for drinking. People resort to buying filtered water at significant expense. The sand filter cleans out 99% of organic contaminants, including giardia and cryptosporidium, and is inexpensive to build from locally available materials.
Fossil fuels are saved in the reduction of transportation of purified water, and people save money on buying it. The filter is made from plans endorsed by the United Nations.
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Oaxaca, Mexico
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