A de-mineralizer for a fuel cell includes a cartridge assembly including an external outer cartridge and an internal inner cartridge installed inside a housing filled with ion resin, wherein at least one of the inner cartridge and the outer cartridge includes an etching network formed with a plurality of fine holes, in which at least one of a size and distribution of the fine holes are formed differently depending on the respective positions based on a vertical flow direction of the cooling water, and a frame formed on an outer circumferential surface of the etching network to support the etching network.
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