Ion removal system

An ion removal system comprising:

• an electrolysis device configured to generate alkaline water and acid water by electrolysis;
• a hard water flow path connected to the electrolysis device to supply the electrolysis device with hard water;
• a batch treatment tank provided in the hard water flow path to store the hard water;
• a return flow path connected to the batch treatment tank to return the alkaline water or the acid water generated by the electrolysis device to the batch treatment tank;
• a circulation flow path that includes the batch treatment tank, the electrolysis device, and the return flow path;
• a fine bubble generation device configured to generate fine bubbles in the circulation flow path, wherein the generated fine bubbles adsorb and remove metal ions in any one of the acid water, the alkaline water, and the hard water, or a mixture thereof;
• a first flow path and a second flow path through which the alkaline water and the acid water generated by the electrolysis device selectively can alternately flow in first and second modes of operation, and
• a controller,
• wherein the return flow path includes a first return flow path connected from the first flow path to the batch treatment tank, and a second return flow path connected from the second flow path to the batch treatment tank,
• wherein in the first mode of operation, the alkaline water flows in the first flow path and the acid water flows in the second flow path,
• wherein in the second mode of operation, the acid water flows in the first flow path and the alkaline water flows in the second flow path, and
• wherein the controller is configured to switch between the first and second modes of operation by changing a polarity of electrolysis.