In Africa, water scarcity is a huge problem for many of its people. On average, most spend an average of six hours a day searching for a clean water source. A South African NGO has donated and installed 1000 unique water pumps that works on a playground as a merri-go-round water pump. It works by spinning the roundabout to lift water to fill a 2,500 liter tank using only human energy and no electricity. As children spinaround, it transfers their energy into vertical motion that pumps water from the underground borehole to the water tank.
The pump is effective of up to a depth of 100 meters. Amazingly, with children spinning it 16 times every minute, the pump can lift 1,400 liters of water per hour from a depth of 40 meters.