HDPE plastic dimple mat cell and drainage plate/drainage cage
 

HDPE(high-density polyethylene), using high pressure to inject plastic to form hole-lump-shaped shell, with stereo space and support level; in the top of the shell, covering with non-woven as filtering level for water percolation, water storage and water drainage. The plastic storage and drainage plate also named water drainage protection plate or water filtration plate or plastic interlayer board.