Most of us don't give a second thought to our sacrificial anodes - those curious knobs of raw metal found on outdrives, shafts, rudders, and other metal components that dangle under the boat. We know that the anodes somehow react in the water to protect those important metal bits from corroding, and we know that every now and then, over time, they will dissolve in the course of doing their job and need to be replaced. But that's about it. Beyond that, no one really gives them a second thought.
Read the full article here: