25mm 38mm 50mm Plastic Packing PP Pall Ring For Tower Packing Product Description Pall ring packing is a kind of open-hole ring packing with equal ... 続きを読む
25*10mm Aerobic PE06 Biofilm Carrier Floating Filter MBBR Bio Media Product Description Biofilm reactors are divided into fixed bed and flow bed. In ... 続きを読む