A toilet emptier digging the pit down to a level of 2 to 3 meters (depending on the level of the aquifer and the stability of the walls). During this process, the escaping of gaseous ammonia from the anaerobic reduction of nitrate is very strong and a severe working problem for the toilet emptiers, especially when they are not allowed to extend the emptying process over a period of several days (as it was the rare case with this toilet emptier, who was very cautious about health risk, and who, as a former officer of the army, was a person of respect among the people).