The accumulation of scale deposits in dishwashing machines should be prevented for at least two reasons. First, excessive scale deposits on the inside of pipes and pumps will clog them and interfere with the efficient performance of the machine by reducing the volume of water that comes in contact with the utensils during the washing and sanitizing process. Second, scale deposits provide a haven for harmful bacteria.

Chemicals used to descale dishwashing machines are available through Navy supply channels.

Figure 18-10.-Typical automatic double-tank dishwashing machine.