Being that you are in Florida I’m assuming salt water so zinc anodes. Change them when they loose 50% of their mass. The time is based on the galvanic condition of the water, if the boat is kept in the water,... most folks can get a season out of them which in your case is a year.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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