It can be easily installed in a desired place on the ship, and in the installed place, it is possible to take a shower using at least hot water. A soft water generation unit that softens the drinking water through a water pump on the downstream side of the drinking water storage unit, installed in a movable housing through either a hand-push bogie or caster, and the soft water generation unit A soft water supply line that sends soft water to the first outlet through a directional control valve, and a hot water supply line for a shower that has a heating part that uses soft water as hot water and sends the hot water from this heating part to the second outlet, respectively, is installed. The desalination apparatus relates to a marine seawater desalination apparatus further comprising a control unit for controlling each of a high pressure pump, a water feed pump, and a directional control valve.
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