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These are two great Rammer videos from the Malawi team. The first shows the extension pipe and the second an experiment with secondary pumping using a treadle pump.
https://waterforpeople.box.com/s/qk16vhluosn1paeegzvy8bm3pspefbwj
https://waterforpeople.box.com/s/rk7d42i0q4wn0gl6m1vjk3l39jtp0flh