The Hydro BioScience ...

The Hydro BioScience Quattro-DB ultrasonic algae control units were specifically designed to operate outside the cavitation zone so there is no chance of cell lysing.  They also are the only device on the market with a 200 kHz +/- 5 kHz bandwidth in addition to the 41 kHz +/- 17 kHz bandwidth where most competitors systems operate.  The 200 kHz bandwidth was specifically chosen for effectiveness on blue-green algae and is part of our patent claim.  Our devices have 4 way ultrasonic output to create a near radial beam pattern and having the output capability of three to four of our competitors units.  One device can control blue-green algae in a 120 acre (50 ha) circle. 

Hundreds of cyanobacteria gas vesicles per cell are internally broken causing the gas they contain to migrate to the outer cell wall where it slowly diffuses out in several days.  This action leaves the cells permanently heavier than water.  As they sink they cannot get sufficient UV light to create microcystin.  Without it they slowly die of insufficient Nitrogen intake and from the inability of Chlorophyll to produce monosacharrides from photosynthesis.

Ultrasound does not kill most types of cyanobacteria directly.  The misconception that it does is promoted my many who do not understand the process.  In toxic ponds where ultrasound has been used we see the microcystin levels quickly approach the detectability limits of the test procedure.  By dropping the cyanobacteria to the bottom of the water column and out of sufficient light, the production of microcystin is rapidly halted and not released into the water.

George Hutchinson, Pres. AlgaeControl.US LLC