PURPOSE: A processing method of the water for a marine product and a processing system using activated carbon are provided to maintain the sterilizing power instead of sterilizing the ultraviolet ray or the chlorine and block the scent generation or discoloration. CONSTITUTION: A processing method of water for the marine product comprises next steps. The solid material included in the water for the marine product is removed. The solid material it reacts with the ozone the water for the removed marine product. The water for the marine product reacted with the ozone passes through activated carbon. The water for the marine product which passes through with the silicon acid activated carbon bed is reacted. The activated carbon bed additionally includes the photosynthetic bacteria. The activated carbon bed additionally includes the zeolite.
