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Sludging - Asian sludge

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== Acknowledgements==

* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rwsn.ch/ Rural Water Supply Network], and specifically its [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 manual drilling section].

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