Quote Originally Posted by gogolion View Post
came across the sticky about mustard algae. I'm starting to think that is what I have. It is a thin film of "dust" that reappears every day. You don't even really notice it unless you let it build up over days or if you brush it, then it becomes a cloud of dust. The color? I'm not sure. It's sort of green, sort of brown, maybe yellow? It's definitely not a bright breen. My high chlorine levels don't seem to be killing it. Is this what I could be dealing with here?
With a CYA at 10 - 40 ppm, if you chlorinate to FC = 20 ppm daily, and brush after each bleach dump, it should clear up after couple of days. CONTINUE to chlorinate that way, for several days AFTER you no longer see any trace of it.
Sure sounds like it.