I learned about and started using BBB early summer 2009 when my CYA was high and I started to get a little algae here and there. It wasn't much, and very managable, so I never really took care of it. Now I'm in the middle of the shock-and-brush routine to get rid of it.
The good news, I think, is that I thought it was mustard algae, but now I'm not so sure.
I have small patches in various places, and probably the worst spots are actually on the grout and tiles in the skimmer entries. It is a yellowish-green color (no brown to it at all, more bright yellow). Nothing is settled to the bottom that looks like dirt. It removes easily with a brush or by hand, and it has a bit of a slippery feel to it. Lastly, it always reappears in the same place over the course of 5-7 days if I don't brush.
Any help or thoughts on whether this is mustard algae or just green algae. And, if it is green...that is much better than mustard algae, right!!!