In water systems, electromotive force causes ions to flow.
Must have plastic between the mix. Otherwise you get holes in the water
tank!

Martin

On 6/18/2012 6:08 AM, Karl Townsend wrote:

i vote brass bolts. I'm thinking of exhaust manifolds where steel
touches brass bolts. works well, in fact, better than steel bolts. I
have a zillion places where brass plumbing touches steel, brass does
fine.

Karl