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For wells down to 35 m, rope pumps are often 5 times cheaper and more Rotating movement (constant force 5-10 Kg.m) sustainable than piston pumps. Evaluations show that rope pumps on communal wells are being maintained by the users, if introduced properly. 90% Of rope pumps remain operational, even after many years. Continous water flow Because of its low cost, the pump is also popular for domestic use. (1-2 m/s) A survey among 5,025 rural families in Nicaragua indicates that a Schematic PVC pump tubes drawing of a rope pump increases income, even if used for domestic purposes (5-10 Kg) rope pump only. Families with a pump earn US$ 220 per year more than Low pressure in all parts families without a pump. In Nicaragua the pumps are now being (0, Kg/cm) produced commercially by 20 workshops. Few, non-corroDifferent models of Rope pumps were introduced in Africa.This sive pump parts introduction has not always been successful: in some projects over 80% of the pumps do NOT work! However, with the "right" models and the "right" user training, also 90 % remain in operation in Africa, as the Victory model in Ghana and the Elephant model in Zimbabwe have proved.
[[Image:Rope_pump.PNG|thumb|right|150px|[[Rope pump | Rope pump ]], (Victory model) on a hand-dug of 20 meters deep well, made in a local workshop in northern Ghana (for credits, click the picture)]]
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