I am just getting over an extensive shocking phase which means that I must clean my filter twice-three times per day. Usually I can get 2.5 hours on a fresh cleaning. I have had the filter for three years and when I open the filter to clean it there is very little DE on the filter element itself and once I pull the element out the DE is sitting on the bottom of the filter housing in a pile. I do not know if this is because after I pull the plug to let the water out it brings the DE to the bottom or the filter is simply not functioning how it should. I tried to fix the problem by putting less DE in the filter but there was no difference. I put the DE in through the skimmer and make a slurry of DE in water before pouring it?