That makes sense, the magnetic motor will turn regardless of the pump blades. I was imagining the impeller cavitating if the flow was to slow.korndog said:Yep, this from Morebeer.
The magnetic drive acts as a clutch allowing the user to put backpressure on the pump to slow down flow.
korndog said:So on the uphill leg, gravity forces wort (water) down and across the bypass, regulated by the ball valve? That's pretty cool if I am reading it right.