Patent ID: 7393445

Claim:
An electrodeionization module for use in an electrodeionization water purification device, comprising: a frame with a predetermined thickness and having an inflow orifice and an outflow orifice; a cation exchange membrane disposed so as to seal up one side of the frame; an anion exchange membrane disposed so as to seal up the other side of the frame; an intermediate ion exchange membrane for partitioning an internal space defined by the frame, the cation exchange membrane and the anion exchange membrane into a first internal space on a cation exchange membrane side and a second internal space on an anion exchange membrane side; and an ion exchanger filled into the first internal space and second internal space, wherein the ion exchanger has many macropores therein and wherein: the macropores have an open cell structure in which the macropores are interconnected via mesopores, the mesopores have an average diameter of 1 to 1000 μm, a total pore volume is in a range of 1 to 50 ml/g, ion exchange groups are substantially uniformly distributed, and an ion exchange capacity is not less than 0.5 m·equivalent/g of dry porous ion exchanger, wherein the porous ion exchanger has a block shape.