The digester slurry will flow from the expansion chamber to the drying beds (not filled in yet). The drying bed will have a layer of perforated bricks. The liquid will percolate down through the holes in the bricks into a layer of sand and then into a collection pipe (black pipe visible in the middle of the bed ) and out to an irrigation channel. The solids will remain on top for drying and will be removed manually and used as soil conditioner.(Photo: Jun - Jul 2010, GTZ/WSIP (N. Khawaja), Navin Well-Field Area, Herat)