The system can be used where the homes are up to 2km away from the pump. The standard type EMAS pump ejects water with a pressure up to 5 bar, which means that it elevates water up to 50 meters height. With this pressure, water can be conveyed horizontally until 2 Km, provided the dimensions of the tube are sufficient. If the distance is shorter than 500 m, pumping can be carried out with a 1/2" pipe.
==Technical SpecificationConstruction, operations and maintenance== [[Image:Air chamber.jpg|thumb|right|250px|Using a plastic bottle as an air chamber]]
==== Operation====
The EMAS pump produces a pulsating stream. This makes it difficult to transport through a waterpipe, because it originates ram strokes and friction is highly increased. Consequently, the pulsating stream must be transformed into a continuous stream. This can be done by means of an air chamber. An air chamber can simply be a plastic bottle.
All air chambers need adequate maintenance. Water under pressure has the property of absorbing more air than when it is in its usual condition. Therefore after some time, air inside the chamber decreases, and it is not useful any more. According to the characteristics of the system, air in the chamber must be increased at given times. For this purpose, every chamber has a pneumatic valve.
====Manufacturing====
All parts of the system can be manufactured locally:
* [[Small household ferrocement watertanks |ferrocement tank]]
* The air chamber can simply be a plastic bottle.
[[Image:Air chamber.jpg|thumb|right|150px|Using a plastic bottle as an air chamber]]
==Cost==
==Country ExperiencesCosts==
==ManualsField Experiences== ==Reference manuals, videos, and links==
Video manual on how to build an air chamber http://vimeo.com/8454417
Spring catchment with long distance pumping http://vimeo.com/8454057
==Acknowledgements==