Do you have a sand filter? I quickly scrolled back through this thread and didn't see where you told us what type of filter, although I might have just missed it. Many of us with sand filters have been adding a little DE to it to help catch the really fine stuff that the sand filter might not get. If you decide to try it, premix it with some water and pour it in the skimmer while the pump is running. You only want to add a little - enough to raise the filter pressure by 1 psi. Add a cup or so and then wait 20 or 30 minutes to see if it rises. If not, add a little more. Continue slowly until you see the pressure rise by 1. This might help you get your sparkle back! Good luck.