Water Cannot be Cleaned by Machines

A friend of mine has been asked to design a small scale UV-light water purification system for use in the developing world, and he called me to ask what I knew about getting machines to work in poor places. At first I didn’t know what to say to him, because he’s at least as good an engineer as I am, but as the conversation continued I began to discover what he was missing. Engineering is the easy part of getting technology into the developing world. Getting technology accepted, used, maintained, and paid for is the hard part.
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