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No temporary casing is used. Upon reaching the desired depth, drilling fluid is removed from the hole by injecting progressively lower density mud. If unstable layers are present, however, this diluting can make the well collapse before it can be cased. In such cases it may be better to case the well with mud in it and evacuate the mud afterwards by pouring or injecting water into the casing (backwashing).
====Maintenance====
[[Image:Emas3.png|thumb|right|150px|Drilling in process: one person operates the lever, one person guides the drill stem and rotates it, the third person operates the mud pump.]]
[[Image:Emas8.png|thumb|right|150px|Putting in an EMAS flexi-pump.]]
[[Image:Emas7.png|thumb|right|150px|Wetting the cement for the pump base.]]
* EMAS have produced a set of DVDs which cover, among others EMAS drilling and other low cost water supply techniques. [http://emas.blip.tv The movies are available here]. Contact Wolfgang Buchner on [email protected] if you would like to order a copy. The of the movies will also be made available on the webDVD.
==Movies==
