... filament needle-punched The equipment is introduced from Germany. This geotextile can be made of polypropylene (PP), or polyester (PET), ... conservancy, dam, tunnel, subway, environmental protection and so on.Geotextile has good air and water permeability to let water flow ... it so as to effectively control sandrock running-down.Geotextile has good water transmissibility, it can form drainage channels ...