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Many regions in Africa can not acquire clean water directly. The water resource is lacking, it often companies with much sand and bacteria. It is harmful to health if drink the water without treatment. There are almost 6000 people dead for drinking polluted water in Africa. The concave-convex is a bottle capable of purifying sewage quickly, so that it may help to provide safe and clean water for the poor area. The bottle is designed with an interesting and easy operation. The deflated bottle is put into water, and the water is absorbed into the bottle through filter at the bottom. Then, the clean water in bottle can be drunk safely.