I check it a couple of times per year but have never seen more than a little bit of wear. I used to replace it anyhow until our dealer showed me one where you could see the little inner core. He said until you see that core just clean it best I can with a wire brush and put it back in. Our tank has water in it all the time since ours is a continuous outing but draining after each outing would, I would think, prolong the life of the rod.
Some folks had a lot of wear on the anode rod while we all wintered in the Rio Grande Valley. I checked ours before we left and had no wear and just a little bit of crud on the rod. Go figure.
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