SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art in that, when a ship is anchored near a land for a long time (that is, when the ship is exposed to a low-salt sea water environment) Which is a device for preventing the propagation of marine organisms contained in the seawater due to the concentration of the salt contained therein being lower than that of the salt contained in ordinary seawater. When the salt is exposed to the seawater environment, it is introduced into the MGPS without discharging seawater having high salinity discharged from the water purifier. When the concentration of the salt contained in the seawater discharged from the water generator is not sufficiently high, the seawater discharged from the water generator is not discharged to the outside of the ship, but is recycled to the recycle tank, The present invention relates to an apparatus for preventing marine organisms from being used in a low-salt sea water environment capable of supplying seawater having a salt concentration of at least a predetermined level to the MGPS, It is possible to provide a method for effectively preventing the propagation of marine organisms even when the marine vessel is exposed to low-salt marine environment.
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