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I was wondering what the lifespan of a propshaft mounted anode should be.
We got her last year and I mounted 2 of the streamline 1" shaft anodes back in November 2008 and they are both pretty much gone as of now. Is that normal wear? The boat is a 34' Oday in salt water and stays plugged into shore power with the charger on.....don't know if that makes a difference?
 

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You should generally inspect them monthly, and replace them as soon as they're down to about 50% of their original size. Letting them go any smaller than that risks galvanic corrosion occurring and the damage is CUMULATIVE.

If your boat is plugged into the shorepower and you don't have a galvanic isolator, that can be an issue. Also, other boats nearby can cause problems for your boat if they have an electrical fault.
 

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My experience is that 6-9 months can be considered a normal lifespan for shaft zincs. You're fine.
 
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