It just looks like plain green algae to me. Black algae is usually little black dots. Treatment is brush and bleach. You'll need to raise the bleach to shock level and perform the shock process.
You'll need the right test kit. Have you read Pool School?
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.
Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!