For drainage, storage, and infiltration, the EZflow® Gravel-Free French Drain System takes care of high groundwater issues and prevents saturation and surface flooding that can affect your home and property. A convenient alternative to traditional gravel-filled French Drain systems, the EZflow French Drain has a 30% better flow rate, and the preassembled bundle is lightweight for easy handling and installation. The EZflow bundle is made of 6 in. single-wall corrugated pipe of high-density polyethylene (HDPE), centered and surrounded in Poly-Rock™ of expanded polystyrene (EPS), all encased in a black geotextile mesh sleeve.