Jabsco has a range of different models of Waste Pumps where the purpose is to pump away black water (latrine).
Pump Utility 230V is an Impeller pump driven by a 230Volt 1-phase motor. It is suitable as an emptying pump at boatyards or marinas where an emptying station is required.
Jabsco "Macerator pump" is an Impeller pump with a knife at the end that atomizes the latrine before emptying.
Jabsco 50890 is a single-chamber diaphragm pump that is a powerful emptying pump. It is able to run dry.