So I started treating for BA over 1 1/2 weeks ago. Got FC to 40ppm kept it there. Brushed like crazy. Pool looks great. Water is sparkling clear. I have been holding FC around 25-30ppm and brushing at least once a day and shooting for twice a day. We had a lot of BA to begin with. It is practically gone and I go from thinking, Okay we got this, to being frustrated because I see new algae growing it places it wasn't before. The lowest FC has gotten is 17ppm. But it is definitely still coming back.
What should I be doing differently and how long can I expect this process to take? I am just getting frustrated. How can the BA still be growing back with FC so high?