Crush the cause of marine corrosion, electrolysis, stray current and paint bubbling.

Find out how



Corrosion is caused by stray current and any moisture. Metal electrons are negatively charged. The two negatives repel each other causing electrolysis which dissolve your metal into particles.



Corrosion is dependent on an electro-chemical reaction. Identify and eliminate the stray current and you will eliminate any corrosion from occuring.



SeaBis allows you to correctly identify the corrosion causing current and eliminate that cause, saving you thousands of dollars in maintenance and repair.

SeaBis at work! An extremely complex commercial yacht.

Marine electrolysis is the major CAUSE of marine corrosion.

It is the most visible and aggressive corrosion and is caused by stray current.  In order to occur it requires moisture, metal and an electrical current.  That current (explanation down page) is often termed stray current. The SeaBis System with How To Stop Corrosion eliminates the CAUSE of stray current permanently. Even air carried current that creates rust is vastly reduced.

Marine electrolysis is accelerated by stray current.  We eliminate marine corrosion – electrolysis, permanently.  Our system is guaranteed for 8 years with vast verifiable testimonials.  Now the explanation.

An electrical circuit to the Earth is created by metal contacting moisture.  When we connect a battery we vastly accelerate that stray current creating marine corrosion by metal electrolysis. Some call this boat or marina electrolysis or boat corrosion or rust. Marine electrolysis is caused by electrolytic action – see Wikipedia, electrolysis.  Note the Wikipedia apparatus power is red and black – Direct Current (DC or battery current).  Not Alternating Current (AC or inverter or mains or shore power). Rust is created by air carried electrolysis current.

So DC is required to create electrolysis.  By connecting that DC to metal that is other than perfectly dry we create accelerated marine electrolysis. Wikipedia, Earth based current – we must not connect DC to the Earth, via our metal, air or water. The Earth provides a current and return path so completes the circuit.

That marine electrolysis is permanently eliminated by SeaBis Master System. To do so requires identifying the source of the current.  Then repairing or correcting the source – circuit causing it.  We must measure current flow to the Earth then switch off circuits until the stray current is less than the level required to cause corrosion. Then SeaBis Master indicates Normal (green). The last circuit was the cause.  Now follow How To Stop Corrosion.


The SeaBis box proved very useful in tracking down multiple stray current problems aboard our boat. The leading cause was old household wire originally installed by Beneteau and new electronics that had not been earthed correctly. The service from SeaBis was excellent with prompt replies to my queries. I did really appreciate your help. Thanks again for your help, its been A1 service.

Andrew Deeley / SV Utopia II

Hi Glen, Thanks for your help earlier today. I’ve easily isolated the offending components… spreader lights depth sounder …and the starter motor. I guess the latter is due to carbon build up as it is meant to be a separate earth unit. Anyhow, back on track now. Cheers, Mike

Mike Brady

My wife and I are currently circumnavigating aboard our 45 ft. steel yacht. I purchased a SeaBis System after borrowing a friend’s SeaBis and discovering that I, too, had stray current – a flashing red critical light is hard to ignore. This was after the boat had been tested and cleared by the test bulb method. I have no electrical skills but, by following the system, I was able to detect and eliminate the four causes of stray current – a non-isolated genset, a VHF aerial not insulated from the mast, a fuel tank gauge not insulated from the SS day tank, and the connection between a non 12v computer and the SSB radio – to achieve a very satisfying green normal light.

Furthermore, the SeaBis has identified AC leakage from worn brushes in 12v fans and, most recently, a path between the brushes and case on my Balmar alternator, which blew the SeaBis fuse before causing any damage. I consider the SeaBis to be a vital element in diagnosing my yacht’s electrical health. I would also add that Glen has been a great guy to deal with, standing behind his product and providing a wealth of diagnostic advice.

You may use my testimonial with verification.

Mark and Heather Domney

Six years ago I purchased a Dutch barge in Amsterdam, shipped it to the UK and spent four years restoring it to a fully functioning residential boat in my spare time. During this process I learnt much about the ways of vessels which has added to my automobile knowledge. One of the things I learnt was that corrosion was destroying my hull which lead into an investigation, this in turn lead me to the SeaBis. I completed How To Stop Corrosion and time has proven the cause is removed. No more stray current corrosion.

Paul Michelmore

Well Glen your SeaBis system fixed the cause. No problems in 5 months. It was a deck generator and CB radio.

John Singleton

We purchased a steel cruiser 8 years ago and had problems not long after purchase with corrosion on the decks. When the boat was slipped we had evidence of metal corrosion which I think is caused by electrolysis, on the hull as well. When the boat was returned to the water I had a marine electrician check out the boat and he said that our boat was OK and the corrosion was caused by the boat next to us in the marina.

We then believed that was the cause, we tried to get the marina to do something about it but they did not want to know. When the boat was slipped 18 months later the corrosion was that bad we had to sand blast back to bare metal and repaint including the decks. We moved the boat out of marina and put it on a swing mooring, when the boat was slipped again it was evident again. I looked on the web and found the SeaBis site and purchased a unit since then the decks have stopped showing signs of accelerated corrosion. Although we have yet to slip the boat again to check the hull I am confident that the SeaBis unit is performing, as the decks are looking great.

Michael Cuthbert

 Two Volvo engines with a carbon fibre mast and extensive advanced corrosion to engines. One has previously been replaced. The Owner and Peter traced the cause to a separate power supply in the instrumentation. Fitted an isolating diode and isolating switches to both engines. Problem fixed.

Peter – Qualified and experienced Marine Electrician