I'm having trouble getting rid of what I THINK are algae spots all over the bottom of my pool. I had a small outbreak of algae about a week and a half ago. By small, I mean to say that the water was tinted a cloudy green. Compared to some of my previous outbreaks, this was nothin! I kept my pool at shock level for 5-7 days (I lost count but my best guess is 6 days...no less then 5!) The water is back to being clear, but I have a bunch of little blobs of green all over the bottom of my pool. They range in size from about the size of a quarter, to no larger then the size of a baseball card. I brushed all the spots once they started showing up (which was day 4 and 5 of shocking) and they usually re-appeared in a short amount of time. On day 6 I tried vacuuming, and they didn't seem to come back so I stopped shocking. About a day later they came back. Normally I have my pool cover on except when we are swimming, but since I got the algae it's been off. I doubt this could be the cause, but I'm mentioning it just in case. Do I need to get my filter running 24/7 again and get back up to shock level, or can I get rid of this stuff if I keep vacuuming? It seemed to help out when I did it earlier.