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http://www.popsci.com/article/science/finally-way-harvest-hydroelectric-energy-toilet-flushes?dom=PSC&loc=recent&lnk=6&con=finally-a-way-to-harvest-hydroelectric-energy-from-toilet-flushes
Hmmm... if you harness the kinetic energy of a flush, I think you just get a clog.
Do you think it can give a good benefit?
Hard to say but it seems not very likely.
