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update by Paul van Beers
===Acknowledgements===
* [http://www.rural-water-supply.net/en/implementation/handpump-overview/volanta Implementation • Handpump Technology Volanta]. RWSN.
* [http://www.handpumpboode.orgcom/afri_pumpPHPpages/indexproducts-partner-fairwater.htm The Afripump]. Handpump.orgphp