Sacrificial anodes are installed on the boat’s trim tabs and s 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.