Using a 50 gallon plastic drum filled with rocks, gravel, charcoal, and sand to purify water for domestic use.  The filter can be made inexpensively with locally available materials.  

Slow Sand Filter

The local water supply in many small towns 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.

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 by the United Nations.

download  sandfiltration.pdf   Slow Sand Filter Plans.pdf

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Barra de la Cruz, Oaxaca