To install; Simply place the SedCage over the grate, fill provided sandbags half full so they will lie wide and flat (desired thickness it 2”), and surround with sandbags. Installs in minutes. Compare with the 2x4 and silt fence method that must go around the perimeter of the concrete apron. No Restoration. Reusable. Patented. Flood water clear opening 1075 sq.in.