What was sanitation like in the World War 1 trenches?

The latrines was the name given to trench toilets. They were usually pits, 4 ft. to 5 ft. deep, dug at the end of a short sap. Each company had two sanitary personnel whose job it was to keep the latrines in good condition. In many units, officers gave out sanitary duty as a punishment for breaking army regulations. Before a change-over in the trenches, the out-going unit was supposed to fill in its latrines and dig a new one for the new arrivals.