Specifications: An extruded high-density polyethylene drainage core with a non-woven filter fabric bonded to the ridges of the geonet. The filter fabric retains soil or sand particles as well as freshly placed concrete or grout, allowing filtered water to pass into the form to irregular surfaces. Because of this crush-proof nature, geonet drainage composites can be used in the most extreme cases with heavy loads and/or heavy vehicular traffic, both horizontally and vertically.