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You may also be interested in biofilm prevention in these type pipe systems using ultrasonic pulsing.  The vibration from the ultrasound causes anaerobic bacteria from colonizing on the pipe walls.  The colonies attract bivalves and other crustaceans to grow on the walls because they secrete polysaccharides that are food for them.  Ultrasound pulses cause the anaerobes to sense that they are in turbulent water, a place they cannot colonize.  Examples attached.  george@algaecontrol.us