What components are contained within a mixed-bed DI tank?

The correct answer indicates that a mixed-bed deionization (DI) tank contains both cations and anions. In a mixed-bed DI system, the ion exchange resin is a combination of both cation exchange resin and anion exchange resin, which allows for the removal of both positively charged ions (cations) and negatively charged ions (anions) from the water.

The presence of cations, such as sodium, calcium, and magnesium, is crucial as these ions are replaced by hydrogen ions during the ion exchange process. Simultaneously, anions, such as chloride, sulfate, and carbonate, are removed and replaced by hydroxide ions. This dual functionality ensures that the output water is highly purified and meets the stringent quality requirements for applications like hemodialysis.

This comprehensive ion removal is essential in medical settings, where water quality significantly impacts patient safety and treatment effectiveness. By utilizing a mixed-bed DI tank, facilities can achieve very low levels of total dissolved solids (TDS), ensuring the water used in dialysis procedures is free from contaminants.