When Ultrasonic waves of sufficient amplitude are indtroduced into a liquid, the result is cavitations of the liquid at the "rarefaction" or low pressure points of the sound waves, As waves pass by a given point in the liquid, low pressure areas are replaced by high pressure or "Compression" areas. Cavitations bubbles produced under rarefaction implode during compression, resulting in the production of extremely small but highly intense shock waves radiating from the point of implosion. It is these high intensity shock waves that do most of the clearing job.
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