TREMDrain™ 6000 NW is a multi-composite prefabricated drainage material and protection board consisting of a formed polypropylene core covered on one side with a high strength, spun-bonded polypropylene filter fabric. TREMDrain 6000 NW is designed for single-sided subsurface vertical drainage applications requiring a typical non-woven filter fabric bonded to a high compressive strength and high flow capacity formed core.