<b>Fresh Water Treatment & Generation</b> The fresh or drinking water supply consists of water generation, water treatment, water storage in special water tanks (bunker systems) and the (drinking) water supply system. Fresh water is divided into drinking water and service water, whereby a separate system with storage tanks, pipes, pressure tanks and pumps is required for each type of water. Drinking water is used to prepare food, drink, shower and wash dishes. The flush water of the toilet facilities is service water. The process water used is not only drinking water that has been purified after it has been used, but also partially treated seawater. In addition, fresh water is required as boiler feed water, for refilling the fresh cooling water and in the on-board laundry. Today, however, only a common fresh water system for drinking and service water is usually installed on new ships. This saves additional pipelines, tanks and equipment. To roughly determine the fresh water required for the design of the overall system, the need for technical purposes and the drinking water requirement must be determined: For drinking water per person and day, depending on the type of ship (merchant ship, ferry, cruise ship), about 200-500L are assumed. For a more precise determination of the amount of water, especially for passenger ships, empirical values from shipping companies and shipyards are used. In ports, fresh water is supplied on board through bunkering of water from land, while on the high seas, the supply is provided by seawater evaporation in fresh water generators specially developed for use on ships. In addition, the process of microfiltration (reverse osmosis) can also be used to generate fresh water.