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Abstract

Apparatus for controlling algae and bio-organisms in bodies of liquids, such as water. The algae control system includes a first set of ultrasonic transducers and a second set of ultrasonic transducers where at least the second set of transducers emits ultrasonic waves 360 degrees around a vertical axis of a submergible sonic head that includes the sets of transducers. The first set of transducers are controlled to emit ultrasonic waves within a first range of frequencies with a first selected duty cycle and said second set of transducers are controlled to emit ultrasonic waves within a second range of frequencies with a second selected duty cycle. The first and second range of frequencies target different species of organisms. The second set of transducers include one or more groups of transducers that are spaced horizontally around the vertical axis of the sonic head. The multiple groups operate independently of each other.

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First Claim