... impurities are blocked outside,so as to achieve permeability,filtration,drainage once. Features: 1.Pore diameter is small,all-round fiooding ... .Mine last dam,power plant ash dam,landfill plant drainage system; 4.The back of the tunnel wall,the back of ... retaining wall,embankment,road,slope drainage. Product technical index:Diameter of steel wire mmSpace for spring ...