I discovered your site a few days ago. My pool, that I've taken care of for 5 years (when we moved in we had the fiberglass redone), had turned green, and I was disappointed when the pool store test claimed cya was 148! And yet she didn't advise me to do anything about that even though algae was clearly taking over. She wanted me to add more powdered shock (which I had already done just a day or two prior with no noticible difference) After researching, I realize that the shock bags I was using was dichlor and adding significantly to cya, which then made sense as to why more shock wasn't getting rid of the green. Anyway, I ordered the TF-Pro test kit, and I'm anxious for its arrival. Meanwhile I'm doing what I can while I wait, read a lot of the articles here- thank you they are so clearly written and explain so much! The pool making some progress, but I'm excited to be more independent in the care of my pool.