Algae and biofilm control by mimicking turbulence

An apparatus for controlling microorganisms in a body of water, said apparatus comprising:

• a transducer assembly configured to emit sonic waves along a first axis and along a second axis, said first axis perpendicular to said second axis, said transducer assembly configured to be supported a specified distance below a surface of the body of water,
• said transducer assembly including a first transducer and a second transducer,
• said first transducer having a first sonic element disposed between a first pair of blocks, said first sonic element being piezoelectric, said first sonic element in electrical communication with said first pair of blocks, said first transducer defining a first axis through said first pair of blocks, and
• said second transducer having a second sonic element disposed between a second pair of blocks, said second sonic element being piezoelectric, said second sonic element in electrical communication with said second pair of blocks, said second transducer defining a second axis, said second axis perpendicular to said first axis;
• and
• a driver circuit electrically connected to said transducer assembly, said driver circuit causing said transducer assembly to emit sonic waves at a plurality of frequencies in a selected sequence with each one of said plurality of frequencies emitted for an emission duration, said emission duration followed by a off-time duration, said emission duration and said off-time duration defining a total duration, said off-time duration defined as a period between successive ones of said emission durations, said emission duration varying between 10% and 90% of said total duration associated with each one of said plurality of frequencies, said plurality of frequencies emitted by said transducer assembly defining a single cycle, and said driver circuit exciting said transducer assembly to emit a plurality of said single cycles within a 24-hour period.