Rugged ultrasound transducers are bonded to the dry side of the surface or equipment being protected.
Ultrasonic pulses from the transducer produce a pattern of increasing and decreasing pressure on the surface being protected. Through the process of ultrasound-induced non-inertial cavitation, microscopic bubbles are created as the pressure drops and are popped as the pressure increases.
The process does not cause any surface damage and the ultrasound frequencies used don’t propagate far from the vessel surface and are inaudible to marine mammals and fish.
As well as actively preventing the creation of a biofilm, the micro-jets created during bubble-collapse have been proven to prevent barnacle and mussel larvae from embedding on the surface.