mielock wrote:
I've had the same rod for 4 years, and by the looks of things I can continue to use it for a couple more years. I believe the reason is I drain the tank after each use, so most of the time the rod is not in any contact with water.
The anode only reacts when it is immersed in water. Anodes are made of aluminum or magnesium. They sacrifice themselves to the elements in the water that would otherwise attack any exposed steel in the tank. If there is no water in the tank there is no reaction with the anode.