We've been having an algae problem here up north, too. We just added Cutrite (copper sulfate) to our .10 acre pond yesterday. I'll be watching this thread for updates!
It's been awful here. I'm suspecting it's all the leaves from past fall and all the runoff dumping excess nutrients and not enough plant life to use it up before the algae gets going strong. My little pond is pushing 4yo now and it's never been this bad.
Out of pure frustration, this last treatment was a bit stronger than I would normally try, and even tho I only sprayed less than a quarter of the surface, the breezes had the pond circulation spreading it over almost all of the pond. The algae turned milky white as it died and was easy to see. I dont guess it was too strong as I didn't kill any fish and they've been biting pretty good since the treatment.
