PURE WATER MANUFACTURING APPARATUS AND PURE WATER MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a pure water manufacturing apparatus capable of manufacturing pure water with an extremely low boron concentration by a high water recovery rate, and a method for manufacturing the pure water.SOLUTION: The pure water manufacturing apparatus includes: a pre-treating apparatus 5 for treating raw water W0; a first electric deionization apparatus 6A which receives treated water W1 from the pre-treating apparatus 5 into a desalination chamber 11A and performs a deionization treatment to eliminate boron; and a second electric deionization apparatus 6B which receives concentrated water W4 obtained by introducing a part of the desalinated water from the first electric desalination apparatus 6A into a concentration chamber of the first electric deionization apparatus 6A into a desalination chamber 11B, and performs deionization treatment to eliminate boron, and supplies the desalinated water W5 from the second electric deionization apparatus 6B to a front stage of the first electric deionization apparatus 6A.