| 摘要 |
PROBLEM TO BE SOLVED: To feed sodium ion exchange water with a prescribed necessary concentration regardless of alkaline earth metal ion concentration in raw water and to simply and easily regenerate ion exchange resin, in a manufacturing method of the ion exchange water having function of a washing work, etc. SOLUTION: At least one portion of raw water is passed through a hard water preparing room incorporating alkaline earth metal salt, and then it is passed through a water softening room filled with sodium type cation exchange resin. Also, this device is provided with a regeneration room filled with sodium salt, and a water feed path through which raw water is passed through the regeneration room and then is introduced to the water softening room via a flow passage switching means. A detection means of sodium ion concentration or OH ion concentration in the ion exchange water manufactured in the downstream of the water softening room, is provided and a means for sequentially controlling switching of the flowing water path and an opening and stopping means of a regenerate feed part linked with the detection means, is provided. |
