What is the classification of finished water leaving the ion exchange unit?

The classification of finished water leaving the ion exchange unit is often categorized as corrosive. Ion exchange systems are used to remove hardness (calcium and magnesium ions) and other unwanted ions from water. During this process, H+ ions or OH- ions are typically exchanged for the targeted contaminants.

When the ion exchange process involves the exchange of cations, such as when using a sodium-based resin, the water can become corrosive due to an excess of carbon dioxide that may dissolve in the treated water. This can lead to the formation of carbonic acid, which can lower the pH and create acidic conditions, resulting in corrosive properties once out of the unit.

In many settings, particularly in drinking water treatment, the finished water may exhibit a pH below 7, indicating corrosive characteristics and a tendency to corrode pipes and fixtures. Therefore, understanding the specific ion exchange process and the resulting water chemistry is vital in anticipating the potential corrosive nature of the finished water.