I decided to wait before adding CYA since I am backwashing the filter almost every day. I put the CYA (granular) directly in skimmer and I am afraid it will all be gone when I backwash. Pool is still not looking completely clean. Its hard to remove them. And they dont seem to be turning brown at all, the algae that I catch are all the ones that I brush off from the walls and get caught in fine mesh skimmer and the filter. I was hoping that once I brush the walls a bit, algae should come off quickly and turn brown. I maintain the shock level of 15ppm all the time. The walls are a bit blackish, but the algae that get caught in the skimmer mesh is green.