The anaerobic biodigester analyzed in the present study was designed for the treatment of domestic wastewater in a test restroom, characterized by its continuous flow, low organic load and a four-stage processing system. The value of the prototype under research consists in the real daily conditions under which it was tested. The first stage consisted of the site selection, and the manufacture of a waterproof iron reinforced cement prototype, with a 1m 3 loading capacity. At this stage, during the period from august to december 2011, the reactor was inoculated with organic matter originating from the aforementioned restroom discharges. The evaluation of this stage consisted in taking measurements of the following field parameters: pH, electrical conductivity, sedimentable solids, and inflow and outflow temperature along the system. These records substantiated the behaviour of the processes within the digester during the starting phase.