PRO Series Cation Mixed Bed Color-Changing DI Resin for RO/DI Systems

Produce ultra-pure, 0 TDS water for your reef aquarium with the PRO Series Cation Mixed Bed Color-Changing DI Resin. Designed as the final polishing stage in advanced RO/DI filtration systems, this premium mixed-bed resin efficiently removes any remaining dissolved ions that pass through the reverse osmosis membrane, helping provide the cleanest possible source water for saltwater aquariums.

This specialized mixed-bed resin contains both cation and anion exchange media, with a color-changing cation indicator that transitions from purple to amber as the resin becomes exhausted. The visual color change makes it easy to monitor resin life and schedule replacements before water quality is affected. It is particularly well suited for aquariums where source water contains elevated levels of positively charged contaminants such as calcium, magnesium, aluminum, and iron.

Key Features

• Produces ultra-pure 0 TDS water for reef aquariums

• Mixed-bed ion exchange resin for maximum water polishing

• Color-changing indicator changes from purple to amber as the resin is depleted

• Removes remaining dissolved minerals and contaminants after the RO membrane

• Helps reduce unwanted nutrients and impurities that can contribute to nuisance algae and poor coral health

• Ideal for refillable DI cartridges in most standard RO/DI filtration systems

• Vacuum-sealed packaging helps preserve freshness and extends shelf life until opened.

Whether you're mixing new saltwater or producing top-off water, high-quality DI resin is essential for maintaining stable water chemistry. Replacing exhausted resin before TDS rises helps protect sensitive corals, fish, and invertebrates while ensuring consistent water quality for long-term reef success.