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I always just wirebrushed some of the crud off the rod although I understand that's not really necessary. My dealer showed me an anode rod with about half the center core showing. He said when about half of it shows it's time to replace the rod.
At the seminar Indy Roadrunner mentioned, we were told the rods you buy at Camping World are made of a substance that is not ideal. I forgot which materials are good and which are bad as my notes are also buried but maybe someone recalls and will post that info. I think he said the good ones are available at rv dealers. I think.
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