| 摘要 |
PROBLEM TO BE SOLVED: To provide a water purifier capable of removing phosphoric acid in water in the water tank. SOLUTION: This water purifier D1 is such one as to be equipped with a water tank 1 for raising fishes-and-shellfishes or the like, a water holding tank 2, a decoloration tank 3, a filtration tank 10, a set of electrodes 4 in the water holding tank 2, a direct current source for supplying electric current to the electrodes 4, an electrode holder 5, a pumping pipe 6, a pump 7, and a return pipe 12; wherein the water holding tank 2 is intended to remove phosphoric acid in the water in the water tank 1 and set up between the pumping pipe 6 and the decoloration tank 3; and the electrodes 4, each of which is made of a rectangular iron plate, serve to leach out iron ions by the aid of electrolysis so as to remove the above-mentioned phosphoric acid, and the iron ions thus leached out react with the phosphoric acid and then flocculate as water-insoluble phosphorus compounds.
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