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The question as to how often zincs were replaced was asked at one of our Power Squadron meetings, and almost everyone said their zincs needed to changed at about 3 months. 3 months seemed to be how long it took to erode the zincs to 50% in the salt water in our marinas, and 50% is when they should be changed. In my case I have an isolator installed, and my zincs are at 50% at around 5 to 6 months.
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