| 摘要 |
PROBLEM TO BE SOLVED: To provide an ion exchange apparatus that can reduce the amount of water discharged from a pressure tank for the purpose of discharging the retained water.SOLUTION: Provided is an ion exchange apparatus (1) including a pressure tank (2) for housing an ion exchange resin bed (211), circulation means (3) and circulation control means (510), in which it is characterized in that: the circulation control means (510) is configured so as to start a regeneration mode instead of starting a washing mode when a washing start condition is satisfied during the period when a moving-up renewable condition is satisfied; the washing start condition is set so as not to start the washing mode during a predetermined period immediately after the shift to a water treatment mode; the regeneration start condition is that an integrated water flow duration (D) is at least a water in-take possible duration or more; the integrated water flow duration is the total duration of the raw water flowed through the pressure tank (2) during the water treatment mode executed after the finish of the regeneration mode of the last time; and the moving-up renewable condition is that the integrated water flow duration (D) is at least a moving-up renewable water in-take duration or more. |
