On Thu, 26 Nov 2009 18:38:50 -0800, "Jon Danniken"
wrote:

wrote:
What could I do to eliminate and prevent future growth?

You can't beat this product.

http://www.sprayandforget.com/

I don't trust anything that says it's "eco-friendly".

Jon

I don't care if it's eco friendly or not. It works. I had black algae
stains all over my white shingled roof. They are gone. Not plants
or animals were harmed in the process.