Well it might not make a huge difference where in the house one opens a tap for that waterturbine , but still its connected inline of a warerpipe so maybe there is some "back-pressure" braking/slowing the turbines speed ....
I had one of those in Ireland on my kitchen tap to produce ozone and the rated power of the inbuilt waterturbine was 3 watt to power that ozone generator
worked extremely well for years and i got water tested twice from this tap and the report said "Potable drinking water to EU standards" and that was basicaly coming from a self built pond.
But anyway , when i connected a hose to the outlet the internal turbine did not produce enough energy after
And low head water turbines spring to my mind too, as they have a long draft tube attached to the outlet of the turbine to increase the suction of the incoming water so the waterpreasure from the inlet and the suction from the outlet shake hands
But for sure that is not the idea behind that threads gadget to leave the tap running for some watts
