Resolve high groundwater issues and prevent saturation and surface flooding on your property with the National Diversified Sales Ezflow EZ-1001F 10" x 10' Black Gravel-Free French Drain System with 4" Slotted Pipe. EZflow is a convenient alternative to traditional stone and pipe drainage, with a 30% better flow rate. The preassembled bundle is lightweight and easy to install, eliminating the backbreaking work of hauling and shoveling gravel into the trench. The EZflow bundle is made of 4 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. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.