| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the regeneration by a method wherein for an ion removing means which removes ionic components such as magnesium and calcium which are contained in supply water, an ion exchanging raw material which takes away the ionic components from the supply water permeating the ion exchanging raw material, and is regenerated by the permeation of a salt water, is used, and the regeneration is conducted before a water supply for a washing. SOLUTION: At the time of a washing process, by opening a solenoid valve 37 for water injection by an indication of a micro-computer, tap water from a water injection conduct pipe is made to flow into the bottom part of a housing case 17. Then, ionic components such as magnesium and calcium in the tap water are removed by an ion exchanging resin when the tap water flows from the bottom to the top in an ion removing body 18, and the tap water which has been changed to a softened water is fed into a washing tank. When the ion exchanging resin of which the ion removing action has been saturated in the ion removing body 18, is regenerated, right before a washing process, the water supply solenoid valve 37 for water injection is temporarily opened before a water supply solenoid valve for regeneration is opened, so that a salt water may be quickly passed through the ion exchanging resin, and the regeneration efficiency is improved. |
