Sacrificial anodes are installed on the boat’s trim tabs and engines to protect metallic parts from corrosion damage. The anodes need to be replaced regularly as they wear out to protect other metallic parts.
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Inspect the anodes monthly.
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Replace them when approximately fifty percent of the anode has deteriorated.
In general, anodes need replacement once a year in fresh water, and more frequently in saltwater environment. If there is an increase in the consumption speed, it can be a sign of electrical issue and the root cause should be investigated.