TREMDrain™ 6600 is a multi-composite prefabricated drainage material and protection board consisting of a formed polypropylene core covered on one side with a high strength, nonwoven needle-punched polypropylene filter fabric that is heat bonded to the core. Heat bonding increases the bond strength of the fabric to the core. The fabric allows water to pass into the drainage core while filtering out extremely fine particulates. The plastic core provides compressive strength and allows high capacity flow to the TREMDrain Total Drain.