Why Does My Pressure Rise Very Quickly, Even After Backwashing?
DE Filters filter the water down 1-3 microns, every time the water passes through the filter. Maintain a balanced, clear pool and this will reduce the incidents of rapid pressure rise. One possibility for a rise is that the filter grids or flex tubes are clogged with minerals or oils. You should clean your grids once a year or season with a degreaser or acid bath (every 45 days as per Hayward’s recommendations). Minerals and oils embed themselves in the fabric of the filter and reduce the available surface area used for filtering. If too little DE is added during pre-coat, debris and particles will embed in the fabric. Cleaning with a high pressure hose, NOT A POWER WASHER, may be needed to remove the grease. If cleaning does not work, then replacement is the only option.