Man, that bites. I don't know that aluminum would do much better though if it's the salt eating the rad. Might want to do a bit of research on that. Aluminum will pitt pretty fast in a corrosive environment. If I remember my chemistry right aluminum is higer up on the periodic table so it should corrode even faster than copper. I also belive copper is a superior conductor for heat - don't know what the alum. rad. advertisers are saying though. It might come down to the gage of the tubing being used and if they put a good anodic coating on the alum. for protection.