Abstract: There is disclosed a water treatment device capable of improving the treatment efficiency of for-treatment water and passing the for-treatment water once to sufficiently treat the water without repeatedly circulating the water, and the water treatment device includes a water passing first electrode arranged in the channel of the for-treatment water, a conductive fiber positioned on the downstream side of this first electrode and energized by the first electrode, a water passing second electrode positioned on the downstream side of this conductive fiber and forming a pair with the first electrode, an insulating porous spacer interposed between this second electrode and the conductive fiber, and a supply section which supplies voltages to both of the electrodes.

Abstract: There is disclosed a water feed device capable of adding mineral components to for-treatment water in accordance with user's request to feed a variety of water including the mineral components from soft water to hard water. Furthermore, there is disclosed a water feed device capable of selecting a treatment function to be performed with respect to the for-treatment water in accordance with the type of water for use as the for-treatment water, a use situation and a purpose, to perform an optimum treatment. A water feed device S of the present invention includes a mineral addition treatment unit which has one or more mineral components and which adds the mineral components to the for-treatment water; and a control unit which has data concerning the one or more mineral components of mineral water and which controls the addition of the mineral components by the mineral addition treatment unit in accordance with the selected mineral water.

Abstract: There are disclosed an especially inexpensive and compact ion removal device capable of removing ions of scales generated from for-treatment water, a surfactant and the like, and a method for using the device. In an ion removal device S of the present invention, at least a pair of electrodes (a first electrode 6 and a second electrode 7) immersed into for-treatment water are integrated with an surfactant collection material 9 and a scale collection material 8 as ion collection materials. Then, these ion collection materials (the surfactant collection material 9 and the scale collection material 8) are arranged between the first electrode 6 and the second electrode 7.

Abstract: Provided is a water treatment device which efficiently removes an oxidant from water to be treated. The water treatment device according to the present invention includes: a fiber electrode; a first electrode which is disposed downstream in a flow path for the water to be treated and is connected to the fiber electrode, and which is applied with a negative potential; a second electrode which is disposed apart from the fiber electrode and upstream of the first electrode in the flow path, and which is applied with a positive potential; and supplying means which applies the negative and positive potentials to the first electrode and the second electrode, respectively. Such a configuration allows the oxidant represented by hypochlorous acid to be removed from the water to be treated.

Abstract: There is disclosed a water treatment device capable of improving the treatment efficiency of for-treatment water and passing the for-treatment water once to sufficiently treat the water without repeatedly circulating the water, and the water treatment device includes a water passing first electrode arranged in the channel of the for-treatment water, a conductive fiber positioned on the downstream side of this first electrode and energized by the first electrode, a water passing second electrode positioned on the downstream side of this conductive fiber and forming a pair with the first electrode, an insulating porous spacer interposed between this second electrode and the conductive fiber, and a supply section which supplies voltages to both of the electrodes.