We have a 1/4 acre pond about 12' to 14' foot in the deepest part.I have been fighting some duck weed and watermeal or meal weed. I have been spot spraying Reward with some dish soap as a surfactant for the past couple of years. I also have lilly pads on one end of the pond that I have to protect from the Reward. Now that it has cooled down here in southern Ohio I see this film all over the pond. We do not get much wind across the pond so it pretty much covers it. In the spring I see also a film that I thought was pollen from the pine trees around the pond. Does anyone know what this might be? And what to do to rid of it.