I've noticed that my skimmers don't really collect anything. Before today, the main drain and both skimmer valves were completely open. I decided to close the main drain pipe a little to see if it would make a difference. I did notice a little more current in the skimmer area, where before there was none. Both skimmers were still pretty clean. Any advice on how I can make sure everything is working correct. I know that that stuff is collected in the filter because i still have to backwash my filter and it looks dirty when I do. The thing is that I regularly see stuff floating on top of the pool and baskets are clean.