Just when I’m about to rinse my hair for the second time and rinsing the soap out of my ears, the shower cuts off. I reach up, unscrew the freakish instrument from the pipe, and toss it in the nearby sink. And then finish the shower with the...

As described, this appears to be a design for a perpetual motion machine. There’s nothing except gravity used to propel water through the turbine, and that energy is lost pushing the water back up to the holding tank.