Petra Wadstrom is a Swedish inventor has developed a solar-powered water purifier that could provide billions of the world’s poorest people with access to clean and disease-free drinking water. The purifier treats 10 litres of water at once, all within a compact case. The cost of the unit is to be set at around just $35, which would make it very affordable for many aid agencies.
The Solvatten uses solar energy to treat the contaminated water with ultra-violet (UV) rays. The UV rays essentially render all bacteria and viruses inert. The purifier does not need any special technical skills and is completely portable. The price, ease of use and portability make it a great device for developing countries who need access to safe drinking water.
Source: CleanTechnica