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Solution of the week 3

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===Tried and true - treating water with chlorine===

Do you like chlorine? I do. Although I might not particularly like the taste of it, it is by far the easiest and cheapest way to disinfect water and make it drinkable, and it probably helped to save more lives than any other single chemical substance on Earth. Using simple techniques, it can be produced and sold locally in developing countries.

The problem is that in many developing countries, chlorine is imported, rather than produced locally. This leads to a much higher price, as transportation and storage add to the costs. In remote areas, the delivery chain can easily fall apart, preventing this life-saving substance from reaching the people who need it most.

[[Image:wata-mamauzima.jpg|thumb|~~center~~right|~~300px~~200px| Health Education agents from the [http://www.antenna.ch/en/drinking_water/wata_drc_en.html" Mama Uzima programme] in the Democratic Republic of Congo produce, promote and sell chlorine. Photo courtesy of Antenna Technologies.]]

====A $40 chlorine factory====

Winona

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