J-Drain® 1000 consists of a heavy duty high density polyethylene geonet drainage core with its ridges heat fused to a layer of non-woven fabric. The filter fabric retains soil or sand particles as well as freshly placed concrete or grout, allowing filtered water to pass through to the drainage core. J-Drain® 1000 is identical to J-Drain® 300 in physical properties with the addition of a layer of heavy duty grey fabric bonded to the back side providing protection and cushion for waterproofing systems requiring a protection layer.