The water pump is a simple centrifugal pump driven by a belt connected to the crankshaft of the engine. the pump circulates fluid whenever the engine is running.

The pumping unit supplying the tested models consists in one horizontal shaft centrifugal pump driven by a variable speed D. C. motor itself controlled by a thyristor speed drive.

Practice proves that using this design will reduce both operation cost and maintenance cost. This technology has popularizing significance in sewage treatment and water reclamation engineering.