Bulk Reef Supply PRO Series Cation DI Resin (Color Changing) - Part 1 1.25 lbs

Changes from Purple to Amber when exhausted

Cation Single Bed Color Changing DI Resin is great for people that want to be more efficient with their deionization resin usage. Single bed resins do require the use of a cation and anion resins followed by a mixed bed resin, but produce much better results, and are much more efficient!