As a new pond owner, I did a lot of research and everything came up pretty much - Do NOT use copper sulfate. When I do have an algae/plant problem etc., I too, will be looking for something other than it to control the problems. Keep up the great site Pond Boss--I just love my Pond Boss magazines--they and this site are a wealth of information that without I wouldn't know what the hec I'm doing with this Pond.
