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Rope pump - For wells down to 35 m, rope pumps are often five times cheaper and more 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. Because of its low cost, the pump is also popular for domestic use. A survey among 5,025 rural families in Nicaragua indicates that a rope pump increases income, even if used for domestic purposes only. More about Rope pumps