Cutting marine antifouling costs

Sonihull is transforming how marine operators prevent biofouling on their vessels and structures. Antifouling costs the maritime sector about $100 billion every year. Left unchecked, fouling can increase hydrodynamic drag and fuel costs by up to 60%. If your raw seawater cooling systems are colonised, main equipment can overheat and fail and you could be totally out of commission.

Cut costs and reduce downtime

Keeping vessel operating costs down, is critical to your bottom line. If you are operating with Impressed Current Anti-fouling (ICAF) systems protecting your box coolers, you could save up to 90% of their Capital and lifetime MRO costs if you replace them with Sonihull systems.
If your vessel is off-duty, due to reduced demand or lock-down restrictions, it is under attack just sitting at anchor. Coatings don’t work when you are stationary and ICAF systems will only work properly when the main systems are running. Fitting a Sonihull system will protect idle systems from biofouling and avoid the need to drydock before safely re-commissioning.

Save fuel while protecting your engine

Sonihull is leading the way by transforming the way the marine industry approaches the subject of Antifouling: a $100 billion industry.

When marine growth builds upon a ship’s hull it can increase drag and fuel costs by up to 60%.  When fouling builds up in the raw-water cooling system, it can destroy the main engine, and even render a vessel out-of-commission.

Sonihull vs ICAF - Cost Comparison

Here are some typical installation costs for a 4-box cooler setup.



System Cost £10,400


Installation Cost £3200


Commissioning Cost £3200


MRO £72,000


Total £88,800


For commercial vessels with an operational lifespan of 15 years, the decision to switch to Sonihull ultrasonic protection becomes very easy to make. With lower capital costs and no ongoing maintenance costs for the regular replacement of expensive ICAF sacrificial copper anodes, Sonihull will save you in the region of £79k on just 4 box coolers. And this figure does not take in to account reduced drydock and downtime costs.

Fitting – safe, survey-free and no drydock

Sonihull systems can be fitted by small, isolated teams in a matter of hours. There’s no need to drydock, there’s no cutting, drilling or welding and therefore no need for Class re-surveying. This means that work can be carried out in accordance with COVID-mandated guidelines. Sonihull systems can even be fitted whilst at sea.

Drydock – An expensive business

Getting estimates for drydocking costs is an open-ended process. For coating systems alone, you have to account for stripping, coating, waste removal, and antifouling re-application. The following is an estimate for an average drydock schedule for a medium-sized cargo ship:
Average Docking Time:

10 - 14 Days

Average Docking Interval:

4 - 5 Years

Average Docking Cost:


*This is dependent on the size, age, and complexity of the ship and the type of regular maintenance being completed during drydocking. Losses from downtime and out-of-survey costs, like main equipment repairs and other unforeseen costs, are not accounted for.

In summary

The impact of biofouling, and the measures to prevent it, costs the commercial shipping sector somewhere in the ballpark $100 billion annually. Currently 95% of all antifouling systems rely on poisonous biocides to kill organisms that settle on surfaces – dosing the oceans with toxic biocides – this is not sustainable, and legislation is catching-up.
The Sonihull system is a zero-harm solution. There’s no toxic environmental legacy and no microplastics are shed from ablative coatings. Sonihull is the only safe solution for all marine life.

Protect your vessel

Sonihull’s mission is to deliver environmentally safe, cost effective antifouling wherever unwanted bio-fouling persists. Our vision is:

To make dosing the oceans with poisonous biocides and microplastics a thing of the past
To deliver effective antifouling systems using the power of ultrasound
To save the oceans, one ship at a time