Hello all....I am currently having a problem with my Hayward EC65 DE filter. The filter has been working great all summer until I recently cleaned the filter and recharged it. When I try to precoat the filter most of the DE will flow through the filter and into the pool via the return lines. Ive done this process many times without any problems in the past. I replaced the check valve but the same result happened. I dismantled the filter and visually inspected the Tube Sheet, Diaphragm gasket, and the flex tubes. All these parts are in excellant shape (filter 1.5 yrs old). I'm currently at a standstill and have no idea where to go from here. Any suggestions would be greatly appriciated.