Roger, I don't know is they still do, but in times past copper powder was added to the concret used to pour the floors of hospitals.
Copper is a germicide also. > Marshall: Most assuredly. That's part of the plan, but in the meantime, the > odds are that metal ions (corrosion chemistry suggests copper or zinc, but > let's see) are entering the water. Incidentally, I believe ionic copper, > which would be present in silver coinage, is a germicide as well as ionic > silver. This possibility, if proven to be correct, would come as a surprise > to many of us who thought that the silver in precious metal coins was the > only active germicide. Roger "Ole Bob'
