Drainage membrane PM 3D-GEOTEX W8 PM 3D-GEOTEX W8 is a strong 8 mm high three-dimensional composite with an exceptionally high drainage capacity. PM 3D- GEOTEX M20M PM 3D-GEOTEX M20M is a lightweight, three-dimensional composite with an exceptionally high drainage capacity. PM 3D- GEOTEX M20 PM 3D-GEOTEX M20 is a light 20 mm high three-dimensional composite with an exceptionally high drainage capacity.