The [[Treadle_pump|treadle pump]] fulfills all these demands with flying colors. It is a foot-powered water pump widely used in Asia and spreading in Africa. It consists of two metal cylinders with pistons that are operated by a natural walking motion on two treadles. It is ideally suited for use on small farms which draw irrigation water from 1-7 m deep. Because it is a suction pump, the depth is limited to about 8m.
[[Image:treadle1Treadle_pump.jpgPNG|thumb|center|250px| Tippy Tap next to a latrine in Uganda]]