How to stop marine corrosion, electrolysis, stray current, CAUSE in 3 steps, permanently.

Marine electrolysis is ONLY caused by stray current.

SeaBis System corrects the CAUSE so stops marine corrosion, electrolysis.

Battery, AC and shore power! We correct the cause. Completely and permanently. We succeed whereas a multi meter or half cell or reference or test lamp MUST fail.

Contacting us is free.  Waiting WILL cost you thousands $s. 

and we will step you thru

How to Stop Marine Electrolysis

No thru hull penetration or moving parts or additional coating or additional anodes. Probably no Blocker or Isolating Transformer. SeaBis replaces them all. There are manufactures with a long life as a principle, rather than selling spare parts. There is a solution. Talk to us before buying.

8 year guarantee. 20 year design life.

Find out how

How to prevent marine corrosion and electrolysis


Stray current causes corrosion.  That includes boat or marina, rust, rig and process line corrosion. It does so by electrolysis. The SeaBis System controls them all.



Corrosion is dependent on an electro-chemical reaction. Identify and correct the stray current and you will prevent ALL corrosion from occurring.


Eliminate the CAUSE

SeaBis Master System correctly identifies the CAUSE of stray current corrosion – electrolysis and corrects that cause, saving you thousands of dollars in maintenance and repair.

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Press Fast Track button. 
We will step you thru it.

*Most only need one SeaBis.* Video is of an extremely complex commercial yacht.  After a year use of SeaBis there are no paint bubbles! Read the reference. SEE the photo proof: seabis-reference
Save thousands $s – LISTEN – you have a friend.

How to stop marine corrosion, electrolysis CAUSE in 3 steps, permanently.

Step 1: Identify

Nearly all marine corrosion is caused by electrolysis. 

Marine electrolysis is ONLY caused by stray current.  It is the CAUSE of all the following:

Stray current dissolves your metal

Marine electrolysis caused by stray current

Electrolysis corrodes propeller

Propeller corrosion caused by stray current creating electrolysis. Stainless steel forms worm holes.

Stray current corrosion

Electrolysis created by stray current corrosion to engine leg in 14 days

Weld has a lowers resistance to stray current

Weld attracts stray current corrosion

Electrolysis dissolves the metal hull

Electrolysis dissolves the metal under the paint

Typical electrolysis white growth

Typical electrolysis white growth.  CAUSE is prevented by SeaBis System.


Marine electrolysis corrosion is caused by stray current.  I witness that stray current destroy propellers and hulls in 10 days, many times every year.  Most importantly, wiring or equipment defects on board your vessel cause the stray current. The resulting stray current flows from your vessel to the Earth.  SeaBis Master System pays for itself, very quickly, correcting the stray current CAUSE.  So saving you many thousands dollars.


Step 2: Understand

How to prevent marine corrosion and electrolysis.
SeaBis stops CAUSE of stray current

Stray current – electrolytic corrosion CAUSE eliminated

Most importantly stray current is dependent on ALL of 3 inputs: moisture, metal and an electrical (stray) current.  Therefore elimination of stray current prevents corrosion.

In conclusion the SeaBis System with How To Stop Corrosion permanently prevents the CAUSE of stray current that creates marine corrosion by electrolysis.

Current explanation at How page.

Step 3: Eliminate

To complete repair:

First use SeaBis to measure current flow to the Earth.  Observing the lights on SeaBis. Second, identify the circuit causing stray current by switching off circuits until SeaBis Master indicates Normal (green).  The last circuit you switched off was the cause.  Finally stop the CAUSE, follow How To Stop Corrosion. Then our 8 year guarantee applies.

Questions and answers:

Do you doubt corrosion is caused by stray current?

Then see Wikipedia, electrolysis. You will see the Wikipedia apparatus power is red and black – so must be Direct Current (DC or battery current). Wikipedia text clearly states DC current. Wikipedia does not state Alternating Current (AC or inverter or mains or shore power). So shore power or AC cannot be the cause.

Anodes?  Can I add more to prevent corrosion:

A one kilo gram (1000 grams) or two pound anode generates one millionth (0.000001) of an amp protective current.  Whereas stray current is thousandths (0.001) or whole amps.  So stray current is at least a thousand times stronger.  Therefore you would need at least 1,000 kilo grams of anode! Now use SeaBis Master System to prevent the CAUSE, completely and permanently.

Multi meter, half cell, reference electrode or test lamp?  Can any of them  prevent corrosion?

Sorry but no. The consequence will be to waste your time and money while corrosion escalates. The reason is corrosion is caused by CURRENT flow to the Earth. They will measure the COMBINED  VOLTAGE of every vessel within 200 meters and that of the Earth.  The result is misleading information.  Therefore use SeaBis Master System to measure current flow to the Earth and correct the cause –  it works 100%. That is why we provide a 8 year guarantee.

Stray current accelerates corrosion. How to stop it:

First the corrosive ability of marine electrolysis depends on causes in your boat.  Second every other boat within at least 180 meters.  In addition water depth less than 180 meters causes the Earth to have a corrosive affect. SeaBis measures the  TOTAL stray current affecting your boat ONLY. Now use the SeaBis Master System to prevent the CAUSE of stray current, permanently. Therefore preventing nearly all corrosion.

Your metal contacts moisture:

Moisture touching metal creates an electrical circuit to the Earth. Now when you connect a battery it vastly accelerates stray current.  So creating corrosion by marine electrolysis. Often this  is termed boat or marina corrosion or rust.

AC or shore power cannot be the cause:

AC is the abbreviation for Alternating Current.  It reverses direction every half Cycle or Hertz.  So IF a particle is removed in the first half Cycle it will be replaced in second half Cycle . Therefore AC cannot cause electrolysis.  In addition, if there were DC in AC then every AC appliance would burn out in a few seconds. The reason is: DC has no  Counter Motive Force (Back EMF).  So do not blame the shore connection.  The SeaBis System will correct the cause IF there is DC in AC.

Rust cause:

Air carries stray current causing marine electrolysis. Therefore creates rust. In conclusion preventing stray current reduces rust. Use SeaBis!

More proof: 

Wikipedia explains the cause:  See Wikipedia, Earth based current – the Earth provides a current and electrical path that causes the stray current to increase.  In addition, both water and air are conductors. So they complete the circuit to the Earth.
Now correct the CAUSE: Use the SeaBis Master System to identify and PREVENT the cause.

Link to How to conquer corrosion in 3 steps

Link to Self paced Training Course

Proof why we are correct Wikipedia

Technical explanation (easily understood)

SeaBis Master System stops the CAUSE of stray current – electrolysis.

Common names are rust, electrolysis, electrolytic action, marina corrosion, boat corrosion and galvanic. The CAUSE is always the same-marine electrolysis caused by faults on your boat.  The solution is to use SeaBis Master System to Identify, understand, then eliminate the cause, permanently.

Marine electrolysis is caused by stray current flowing from your vessel to the Earth.  This is where SeaBis pays for itself, very quickly.  SeaBis Master System eliminates stray current CAUSE.  So saving you many thousands dollars.

  1. What is electrolysis?
    Electric current attracted to the Earth (we stand on) carrying your metal with it to the Earth.
  2. What is rust and galvanic corrosion?
    Rust is simply air carried current often vastly accelerated by stray current – electrolysis.
    Galvanic  corrosion is a minority cause and caused by two different metals being in proximity in a conductor such as water.  Galvanic is a million times slower than stray current corrosion – electrolysis.  Anodes, when stray current corrosion is eliminated, will stop galvanic and should last 3 to 4 years.  If they do not then stray current is the cause. Galvanic corrosion is vastly accelerated by electrolysis. 
  3. What is the solution?
    This is where SeaBis pays for itself, very quickly.  SeaBis Master System eliminates stray current CAUSE.  So saving you many thousands dollars.


The SeaBis box proved very useful in tracking down multiple stray current problems aboard our boat. Old household wire was the leading cause.  It was originally installed by Beneteau and new electronics that had not been earthed correctly. 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

Marine electrolysis that causes marine corrosion eliminated

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

Marine electrolysis that causes marine corrosion eliminated

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

Marine electrolysis that causes marine corrosion eliminated

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

Marine electrolysis that causes marine corrosion eliminated

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

John Singleton

Marine electrolysis that causes marine corrosion eliminated

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