An old mountain bike, some DIY know-how, a length of tube and a few coats of paint against the elements is all that is needed to turn an old piston-pump into your own fully-functioning mechanical water pump.
This film made in county Mayo shows how to get yourself 10 liters per minute. It could work with a hand-pump as well, turning a simple, cheap device available anywhere in the world into something whihc can supply water for an entire community.
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