I use copper wire purely because I have large amounts of it
lying around at any time. It's not the best thing to be using in a pond
(copper being toxic to invertebrates).

Since most ponds are on the alkaline side, probably not a problem. I'd
worry more about the ends, either stepping on it and puncturing my liner or
my foot. Ouch! ;o) ~ jan


~ jan/WA
Zone 7a