Drum Filter External Feed-Gngep is a professional R&D water treatment manufacturer in China, we manufacture and supplier Fine Bubble Diffuser, Bio Filter Media, Sludge Dewatering Machine, Automatic Chemical Dosing System, Dissolved Air Flotation(DAF), Drum Filter Screen, Screens and Fine Screens, Grit-water separator, Nano Bubble Generator-Jiangsu Guonong Environmental Protection Co., Ltd, professional R&D water treatment manufacturer