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The poor of Kenya, Nigeria... are because of lack of capacity, can not buy fuel to boil water for drinking. So they drink dirty water from rivers and ground water.However, many diseases will spread in these areas.
According to WHO, Switzerland, the water got six hours of sun exposure will be almost able to kill all bacteria, is more effective than the water boiling.
Around a concave point in the product and bump, can keep the connection up and down left and right, to facilitate a large number of transport. In accordance with the needs of each family to expand capacity. Exposure to the sun six hours, you can achieve sterilization.
National Chiao Tung University
Taipei City, Taiwan