'Solarsack' cleans water with heat from sunlight, cheaply and effectively.

'Solarsack' cleans water with heat from sunlight, cheaply and effectively. Two Danish students have developed have developed “SolarSack” for inexpensive and environmentally friendly water purification. The concept was tested in villages, refugee camps and slums in East Africa where it will be marketed. The product, known as SolarSack, is a special bag that is filled with four liters of water and placed in the sun for four hours. Using UVA and UVB rays, as well as heat from the sun, the water is cleaned of pathogenic bacteria. The user can then drink the water and reuse the bag for water purification. The method was approved by the World Health Organization which estimates that between 99.9 and 99.999 percent of the pathogenic bacteria in the water die. The students tested SolarSack in Kenya and Uganda with local users and organizations, and adapted it to their needs. And it's cheap. more