A hand powered wire bush is enough to expose “new” zinc. If the zinc is approaching 1/2 gone, replace the zinc.
The diver’s zinc was at least 10 years old..... still almost all there. I had ALL zinc replaced the last time the boat was hauled. The bow and stern thruster zinc were still good but had them replaced because it was convenient.
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Two days out the hospital after a week in the hospital because of a significant heart attack.
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