EMAS is a Mobile School for Water and Sanitation based in Bolivia, and run by Wolfgang Eloy Buchner. EMAS is also a whole technical and social concept of water and sanitation which includes manual drilling, rain water harvesting, solar water heaters, wind power, hydraulic rams, water treatment, small tanks and sinks, a variety of hand and foot pumps, and ferrocement water storage tanks.
Two of the best known are probably the EMAS Pump, a low cost direct action pump, and EMAS Drilling, a low-cost sludging and percussion method.
EMAS have produced a series of training video available online that show how to make and use the EMAS equipment:
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