The vibrating unit at the bottom of the tank transmits high frequency waves to the liquid. This causes continuous agitation in the liquid and results in the formation of millions of tiny vacuum bubbles. This process is called “Cavitation”. These vacuum bubbles collapse on the surface of the immersed nozzle from all sides exerting enormous explosive force over a tiny area. This action is repeated millions of times per minutes, which dislodges all the dirt and soot particles without any mechanical brushing process on the nozzle head.