Boat Owner Guide
Anodes are the cheapest insurance on your boat. For a few dollars of soft metal, they protect hundreds or thousands of dollars of running gear — as long as they’re replaced before they run out.
Any time dissimilar metals sit in seawater, a small electrical current flows and slowly eats the more vulnerable metal — this is galvanic corrosion. An anode is made of a metal that corrodes preferentially, so the current attacks it instead of your prop and shaft. The anode sacrifices itself; your expensive parts stay protected. That’s the whole, elegant idea.
The simple guideline: replace an anode once it’s about half gone. Waiting until it’s fully consumed leaves your running gear unprotected for however long it sits exposed — and that’s when corrosion starts on the parts you actually care about. Because we inspect your anodes on every cleaning, you’ll always know when one is approaching that mark.
The right anode metal depends on your water. Traditional zinc suits saltwater; aluminum performs well in the brackish, mixed water common around Pinellas County and lasts longer; magnesium is for fresh water. Matching the anode to where your boat lives is part of doing the job properly.
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