What happens to ions in water when resin tanks are exhausted?

When resin tanks are exhausted, previously removed ions may be released back into the water. This process occurs because the ion exchange capacity of the resin is depleted, meaning it can no longer effectively remove contaminants from the water. When the resin is no longer able to exchange as anticipated, it can release the ions that it had previously captured back into the water supply. This is particularly critical in the context of hemodialysis, where maintaining water quality is essential for patient safety. Understanding this release helps dialysis personnel monitor and manage water quality to prevent adverse effects on patients.