Nobody can deny the importance of water in our lives, so it’s rather obvious that in less developed countries, a source of clean water is fundamental. A recent design shows a very interesting notion of a rolling water carrier, but it plus uses the motion of the wheels to drive a reverse osmosis filter through the water, giving folks a method to carry the water easily, and a safe purification means. The filters which last about a year will cost about £20 ($30). It certainly looks like something that can greatly benefit developing countries.

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[Source] dhiram