Welcome to TFP! Here at this forum, we emphasize proper home water testing. It's the most reliable. Pool stores and their products will lead you astray. I would recommend the following:
- Get a TF-100 (link below) or Taylor K_2006C test kit. See Test Kits Compared
- Read the SLAM Process page. That's how we remove algae for good.
- Don't add anything else to your water right now except for regular bleach. But not too much until you get a proper kit and can post a full set of results. We'll coach you from there.
- Don't forget to update your signature as well.