Hydroduct 220 Drainage Composite consists of a thick drainage core and high performance geotextile. Designed to collect and transport water, it is recommended for use on foundation walls, retaining walls, bridge abutments, earth-sheltered structures, tunnels and planters. It serves as a drainage composite and protection course for all Bituthene waterproofing membranes used in vertical applications.

It is a strong, preformed geocomposite drainage sheet system, comprising a hollow studded polystyrene core, covered on one side with a nonwoven, needle punched polypropylene filter fabric and on the other side with a smooth polymeric film.