| 摘要 |
Provided is a discharge machine which changes the specific resistance of a processing solution by allowing the processing solution to flow in a processing solution circulation path having an ion exchange device. The discharge machine comprises: a specific resistance detection unit which detects the specific resistance of the processing solution; a water flow time measuring unit which measures the time where the processing solution flows to the oil exchange device; and a determination unit which determines that the ion exchange device reaches the service life thereof if the change of the specific resistance within a certain time is out of a predetermined setting range. |
