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Ultrasonic antifouling is a technology that uses high frequency sound (ultrasound) to prevent or reduce biofouling on underwater structures, surfaces, and media. Ultrasound is high-frequency sound above the range humans can hear, though other animals may be able to, and otherwise it has the same physical properties as human-audible sound. Ultrasonic antifouling has two primary forms: sub-cavitation intensity and cavitation intensity. Sub-cavitation methods create high frequency vibrations, whilst cavitation methods cause more destructive microscopic pressure changes. Both methods inhibit or prevent biofouling by algae and other single-celled organisms.
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