The Hippo air roller, or Hippo roller, is a device used to carry clean water more easily and efficiently than traditional methods, particularly in the developing world and rural areas. It consists of a barrel-shaped container which holds the water and can roll along the ground, and a handle attached to the axis of the barrel. Currently deployed in rural Africa, its simple and purpose-built nature makes it an example of appropriate technology. The rollers cost around $125 each and they are mainly distributed by NGOs. More information...
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