The brick walls of the hydraulic part of the digester have been laid. The hole to the right is for the outlet pipe to the expansion chamber. The red marking in the wall to the left is to make a hole for the combined inlet pipe from the stable and toilet. (It is better to leave a hole while making the wall; however, the first hole made for the inlet was in the wrong place so a new hole had to be made.) (Photo: Jun - Jul 2010, GTZ/WSIP (N. Khawaja), Navin Well-Field Area, Herat)