... is a lightweight, high strength modular drainage cell designed Drain CellDrain Cell is made of high impact polystyrene, high ... geotextile, Drainage, waterproof, breathe freely, protect wet.The advantage of Drain cell1. High compressive strength ,Light weight , fast Drainage , ... Brick as drainage , use cobblestone as Filter water, The Drain cell instead of cobblestones, save time to install, save ...