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Swiss researcher Martin Wegelin, who is convinced that sunlight (UV radiation) can kill most bacterials in water. Many diseases in developing countries are a direct or indirect result of drinking dirty water. One simple solution to this health problem may be an initiative by a Mr. Wegelin, who claims one day of exposure to sunlight makes the water from a plastic bottle bacteria free. Martin Wegelin is co-ordinator of the SODIS (Solar Water Disinfection) project..