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Nicola, Just commenting on Dave Still's message there - we're looking at getting an eVac shipped to Cambridge for performance benchmarking by an engineering student to compare it with the Gulper I and II, Oxfam manual diaphragm pump and hopefully a few others. This should help map out which different pumps in their "toolkits" can handle various ranges of pit contents, and also link in the economics related to investment decisions by pit emptiers. Jamie