This winner of the Innovate or Die competition filters water through pedal power:
A peristaltic pump attached to the pedal crank draws water from a large tank, through a carbon filter, to a smaller clean tank. The clean tank is removable and closed for contamination-free home storage and use. A clutch engages and disengages the drive belt from the pedal crank, enabling the rider to filter the water while traveling or while stationary.
Aquaduct pedal-powered water transport and filtration – [via] Link.
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