Magnesium the ideal anode material for boats that operate entirely in freshwater. Magnesium anodes have a higher oxidation potential than zinc or aluminum anodes, making them particularly well-suited to the less electrolyte concentrated environmnets of freshwater.
Does not build up oxide layer in freshwater like zinc or aluminum
Not for use in salt or brackish water - except for rare, brief exposures for a total of 14 days per year