I've read about using zinc on roofs to prevent and also to get rid of existing stains. This is known as electroalaysis. I have some questions about this.
#1 Does it work?
#2 How is it sold?
#3 Where is it purchased?
#4 Where is it installed on the roof?
#5 How is it installed?
#6 How much is needed?
Thank you for your time!!!! Please answer by email.