The present invention relates to a water bath, a support that is arranged to extend in the vertical direction on one side of the melting furnace; And it is formed in a spiral surrounding the outer circumferential surface of the support, to form a movement path of the melt discharged from the melting furnace, an inlet for forming the melt discharged from the melting furnace is formed on the upper side, and discharge for discharging the melt on the lower side. Includes a body is formed; including, it is possible to efficiently separate the melt and the slag by using the difference in specific gravity of the melt and the slag.
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