The Universal Color Changing Mixed Bed DI 10-inch cartridge is designed to provide the most effective and user-friendly deionization for saltwater aquariums. It features Aquatic Life MBD-30 Nuclear Grade resin, which combines cation and anion resins (H+ and OH-) to remove remaining total dissolved solids (TDS) from water after it has been filtered through a reverse osmosis membrane. The cartridge includes a top gasket for secure installation and offers improved water-to-resin contact due to its new housing shape, ensuring optimal performance. Additionally, the color-changing feature of the resin simplifies monitoring as it transitions from blue to yellow and then tan to white when exhausted.