Why do anodes matter and when should they be replaced?
The anode is the part that volunteers to be consumed in galvanic corrosion, protecting the shaft, propeller and skin fittings as it erodes. Replace it once more than half has gone.
Why it works this way
Faster-than-expected erosion is a sign that the system is overloaded rather than working, and the usual cause is stray current. Fitting a new anode without measuring simply feeds the same circuit.
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