The Ecovoid HD 2-Inch Cell is a hard recycled polypropylene drainage mat, that can be stacked to create a heavy-duty tank structure to transport or hold water. Also, it is rated H-25 for use as a surface turf or gravel paver. Ecovoid Cells are used instead of Biaxial Geogrid in traffic applications to provide additional support for EcoRain Tank installations. The Cells are used in playing fields, planter boxes, and as French drains around foundations.