I have one Lavac. It works every time, no problem, no odour, no effort (OK, five to seven
pump strokes...big deal!)
It diverts waste to a
holding tank or out of the boat. It can also be used to EMPTY the
holding tank out of the boat.
It can even be used as a bilge
pump with a simple T-fitting.
It is what convinced my wife to buy the boat. The British seem to have forgotten everything they once knew about electrical devices, but when it comes to crap, choose British!
Oh, and Alex, I'm glad you're fixing your heads now...before your next guests arrive!