Filter Case 73 : Stainless Steel Ogawa Microstar Sub Micron USA Carbon Block Today preparing to change this USA carbon block. Open it and take out the old carbon filter. This is the old USA sub micron carbon filter. Prepare change the new one. Pre-filter is ceramic filter candle. Changed done. Flushing water about 30 minutes. Repair Case 6 : Outdoor Filtration Fix Rocket Gasket Filter Case 72 : FY2105 Hot Cold Water Dispenser Filters Cartridge Replace