[[Image:Canzee_icon.png|right|80px]]
[[Image:Deep_well_pump.PNG|thumb|right|200px|EMAS type pump produced and used in Malawi. Photo: Netherlands Water Partnership.]]
[[Image:EMAS3.jpg|thumb|right|200px|An EMAS pump in Nicaragua, made by Paul Cloesen. More at [http://www.flickr.com/photos/paulcloesen/ Paul Cloesen Flickr stream] ]]
[[Image:EMAS1.jpg|thumb|right|200px|An EMAS pump at the WOT, University of Twente [http://www.wot.utwente.nl], the Netherlands.]]
[[Image:diagram installation.jpg|thumb|right|200px|Diagram of a set of water faucets around the house]]
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The EMAS pump (also called the EMAS Flexi pump) is a very cheap PVC piston pump for family use, which can both pump water from a well and pump it to an elevated point. For example, it can pump water from 20 meters underground directly to an elevated tank another 20 meters above the ground level. The ability to pump directly to a storage tank avoids handling of the water, which avoids contamination.
EMAS is not only the name of the mobile school for water and sanitation, but also a whole technical and social concept of water and sanitation which includes rain water harvesting, solar water heaters, windpower, hydraulic rams, water treatment, small tanks and sinks, a variety of hand and foot pumps, and ferrocement tanks. The aim of the technologies and systems is to achieve the necessary supply of drinkable water, and water for micro irrigation in rural and sub urban areas.
===Suitable Conditions===
The EMAS pump is designed for household water supply at family level. Large diameter models can be used for small scale irrigation if the water is very superficial.
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! width="50%" style="background:#efefef;" | Advantages
! style="background:#ffdeadf0f8ff;" | Disadvantages
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| valign="top" | - Comfort of having water supply in the house <br>
===Construction, operations and maintenance===
The [[EMAS pump]] and [[Small household ferrocement watertanks |ferrocement tank ]] need to be operated correctly.
The piston gasket (made from the nylon-reinforced section of a used tire) can wear slowly over time and and must occasionally be replaced. This can be done easily and in less than an hour by a user that understands the simple operation of the pump. If the pump is constructed properly, there will be a range in which the gasket can be adjusted to achieve the proper balance between ease of pumping and hydraulic efficiency between replacements.
===Costs===
The EMAS pump costs about US$ 5 (mainly the metal handle), with 1 US$ extra for each meter depth. (prices from Nicaragua, 2006).
* Tools: US$ 50 - 200 if everything has to be bought new.
===Field Experiences===
Some 20,000 EMAS pumps are in use in Bolivia and some 10,000 in Brazil. It is used in Peru, Equador and Nicaragua. Successfully introduced in South-East Asia (a.o. post-tsunami Sri Lanka) and several African countries.
Successful introduction is variable however, depending on capacity and motivation of early adopters. If people built their pump themselves, they are usually kept in good working condition for years.
===Manuals, videos, and links===
====Videos====
* [http://geocities.com/paulcloesen/DocEMAS/Build-an-EMAS-pump.doc Illustrated EMAS pump construction manual], by Paul Cloesen
* [http://www.food-security.info/pdf%20(English)/ECHO%20(English)/PVCBallValvePumps.pdf A similar design published by ECHO]
* [http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0CDYQFjAD&url=http%3A%2F%2Fgeorggeorg-ritter.info%2Fwp%2Fwp/wp/wp-content%2Fuploads%2F2011%2F12%2FWATER_FOR_EVERYBODY/uploads/2011/12/WATER_FOR_EVERYBODY.pdf&ei=LeOBUIvZB4iNyAHIxIGICA&usg=AFQjCNE0osW_S6BAHIAAGI_fmUdVg0iBXA&sig2=jLQeW6LfMwrPKvlAvXP_bw&cad=rjt WATER FOR EVERYBODY: A Selection of Appropriate Technologies to be used for Drinkable Water EMAS.] Wolfgang Buchner, 5th edition, 2006.
* The Technology Demonstration Center EMAS works with EMAS pumps. See [[Technology Demonstration Centers|Akvopedia article on Technology Demonstration Centers]].
* [http://www.emas-international.de/index.php?id=32&L=3 EMAS website in English]
==Acknowledgements==
* [http://wwwpaulcloesen.google50webs.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CDwQFjAB&url=http%3A%2F%2Fpaulcloesen.50webs.com%2FDocEMAS%2FBuildDocEMAS/Build-an-EMAS-pump.doc&ei=1KytULWcNYeQ2QXUpICwDw&usg=AFQjCNHeJVWulLgRWlg0NwAXTGmYS28U4w&sig2=eu60DUKVRBXp3EuevvDS0A Building an EMAS Pump]. or ([http://www.infolizer.com/p1aul3clo5es5ena1509n5eb2sa13com/Building-an-emas-pump-paul-cloesen.html alternative link]). Paul Cloesen, December 2007.
