• Advantages ultrasonic control:

  • Minimizes use of chemistry

  • No problems with not effective chemicals

  • In accordance with regulations

  • Environmentally friendly

Legionella is a bacterium that can occur in water and can easily be controlled by ultrasound. Inhaling the legionella bacteria in the form of water vapor can have fatal health consequences. Especially so-called wet cooling towers can pose a problem because of cooling of the water in the open air.

In combination with the legally prescribed chemicals that must be present in the water, ultrasound is very effective. This is because one technique complements the other.


With ultrasound, bacteria can be effectively controlled, as concluded in a literature study conducted by the University of Utrecht, called “Ultrasound as a sterilization method“. This concludes: “Bacteria are generally killed very effectively by sonication and cavitation” (page 26). This literature study states on page 29 that a combination with another technique is “very effective” (Dutch).


The operation basically comes down to the following.

The ultrasonic transmitter produces pressure waves that travel through the water. Bacteria will rupture their membranes under the influence of these pressure waves, making the DNA accessible to chemical agents.

The treatment is much faster than just with chemical agents and much more effective. This is because the tearing of the membranes occurs almost immediately. Chemicals normally need some time to dissolve the membranes.

In addition to the literature study of Utrecht, tests in horticulture with the fusarium fungus have also demonstrated these effects. As a result, the use of the amount of chemical agents was substantially reduced (-80%).

The ultrasonic unit can be placed in one of the tanks where the process water regularly passes. Every time the water with bacteria passes the ultrasonic unit, the bacteria are destroyed.