Originally Posted by cavie
second off, Aluminum tanks do NOT need more protection. That is why Atwood does not supply anode Rods with their tanks. Atwoods are made of ALM and zinc. Suburban on the other hand are made of glass-lined steel and are supplied with Anode rods. Atwoods have a nylon drain plug.
I did corrosion studies and cathodic protection work on numerous tanks, equipment, boats, and more. Aluminum is probably one of the poorest metals for application in hard or sea water. It corrodes easily. Like I said before use a magnesium anode on aluminum to protect the tank from corroding.