Professional Marine & Offshore

Five different solutions to avoid biofilm growth on ships and offshore

for Boxcoolers

for Propellers

for Fuel- or Watertanks

for the Hull


Save yourself time and money

  • Highly effective against fouling (algae, grasses, barnacles,mussels)
  • Avoids biofilm in fuel- & watertanks (also dieselbacteria)
  • Saves fuel
  • Increases speed
  • Saves annual expenses of antifouling
  • No more labourous maintenance
  • Environmentally safe & friendly
  • The lowest power consumption (6W) with the biggest range (50m2 / transducer !)
  • No good, money back!


Lots of cooling is required on a seagoing vessel.

Traditionally this is done by bringing in seawater through the sea chest.

Boxcoolers, being continuously exposed to this seawater, are always potential fouling victims. Barnacles, mussels, algae, and other types of shellfish grow on the tubes of the boxcooler and thus affect its heat transfer function.

Classical methods, as using chemicals, to avoid scale or even sea growth are not possible to use in this case, as the chemicals would be needed to put direct in the seawater, what will never work due to the amount of seawater and as well due to the regulations and other authorities.

After a chemical or heated treatment, the bio-film will grow immediately back. So the procedure today is as soon the cooling is not sufficient anymore, the box cooler has to be removed, cleaned and brought back in operation . Of course during the cleaning the vessel can’t be in operation, so this cleaning is very expensive for the ship owners and fouling can start again.

The well known cathodic protections, are expensive and don’t always offer the required no growth warranty. Then the vessel still needs to go in dry dock for cleaning or repairs due to fouling.

Harsonic for Boxcoolers protects the boxcooler 24/7 on low voltage, the sea-chest and the cooling tubes remain free of growth and biofilm.

A propeller in poor state is a disaster

A propeller and his shaft is exposed to all sorts of attacks underwater, such as rusting and adhesions of the sea. It is the key piece of the ship’s propulsion system, and thus deserves special attention.

To continue to use a very dirty propeller is like driving your car on a road that’s in very poor state and full of potholes. We know that very dirty pieces of equipment notably reduce the displacement of the ship. And the same thing happens with the propeller because, although its surface is a lot smaller than that of the ship’s wet hull, its surface area is multiplied by its many revolutions at high speed.

The objective is that it should always be clean of horrible incrustations and calcareous deposits.

Clean fuel tanks are crucial to avoid diesel engine failures

You might have noticed it before :

  • loss of of engine-power
  • excess engine-smoke
  • slimy and dirty or even clogged fuel filters

These symptoms are caused by dirty fuel tanks.

Due to the natural process of fuel degradation (micro-organisms, bacteria and enzyme activity, fungus, yeast and mold) over time, a sludge of waste products accumulates in your fuel tank.

This sludge will form a coating or bio-film on the walls of your fuel tank and clog your filter.

Some people use biocides or chemical products but this makes the situation even worse ! Some of these products even develop bio-film throughout the entire diesel fuel system which causes dramatic filter plugging. Moreover the application of these products are a never ending story and cost a lot of money.

The only good solution is a Harsonic® device which prevents problems and clean the tank completely of bio-film. Harsonic® prevents the built up of the very first step of fouling, which is bio-film.


A clean hull is extremely important! Everybody who has a boat knows the problem: fouling or the growth of all kinds of organisms. Fouling is an annoying problem which reduces speed, increases fuel consumption and causes corrosion damage.

The current solutions are often not effective and require costly annual maintenance. Moreover, they harm the environment and your own health since they contain toxic elements.

Harsonic® avoids the initial step of the fouling, called biofilm. Eliminating the biofilm prevents the development and the attachment of barnacles, mussels, oysters and algae.

Harsonic® keeps the hull of your boat clean without taking the boat out of the water every year for cleaning and repainting.

Fouling can negatively affect your boat’s fuel efficiency, speed and cause increased maintenance costs to remove the fouling. It causes a powerboat to use up to 30% fuel and slows down sailboats because of the increased drag.

It can also affect the maneuverability of the boat. And if you leave fouling attached to your boat for too long you can damage the paint and cause deterioration of your boat overall. Hull fouling is highest for boats that remain stationary in the water for long periods of time.


HARSONIC® avoids growth of biofilm-producing bacteria and fungi and biocorrosion in hydraulic- and lubrication oil systems in offshore installations and ships. By means of Harsonic® there is a much greener and efficient solution than ionization or cathodic systems.

The only effective device which can avoid biofilm is Harsonic®.
Prevent built up from the very first step.

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