Not nearly as scientific as Larry, but I switched to Al this season. Just hauled out, and the anodes are about as wasted as the Zn were, maybe a little less. Our setup is two bonded diver's dreams on the stern and one collar on the propshaft. Zinc pencils in the heat exchangers. Diver's dreams last for four. seasons, shaft anode one. Boating is in a combination brackish and salt. I'll stay with Al now, seems more environmentally friendly.
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