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Not many people know it but zinc annodes are used primarly for saltwater.
A better choice for fresh water is to replace with magnesium annodes.

Ther was a lot of discussion regarding this on Boatered.com try a search there.

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I guess it depends on how badly deteiriated they are. I trailer my boat, so I can go a couple/three years. And I change them for looks anyway. There not that expensive.
 
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