The AquaFX Cation DI Resin is a crucial component for any serious reef or saltwater aquarium hobbyist aiming for pristine water quality. This color-changing deionization resin is specifically designed to work within reverse osmosis (RO) units, ensuring the complete removal of total dissolved solids (TDS) from your incoming tap water. It targets and eliminates common contaminants such as phosphate, silica, nitrate, sulfate, aluminum, and calcium, helping you achieve laboratory-grade 18 Megohm water for your sensitive aquatic environment.

This Cation charged resin, infused with Hydrogen, offers a visual indicator of its exhaustion by changing color from a vibrant purple to amber, signaling when it's time for replacement. Manufactured in the USA, it boasts a robust polymer structure of Styrene/DVB and a gel-type polymer, forming spherical beads with a total capacity exceeding 1.8 meq/mL. Its specifications include a water retention rate of 47 to 56 percent and a screen size distribution of 16 to 50 (U.S. Mesh), ensuring reliable and consistent performance.

This product is ideal for reef and saltwater aquarium owners who demand absolute purity in their water source to prevent water quality issues and foster a healthy, thriving ecosystem. It's particularly beneficial for those using an RO/DI system who appreciate the convenience of a color-changing indicator for maintenance. For optimal results and a complete contaminant removal, it is recommended to use this Cation DI resin in conjunction with Anion resin and a mixed bed DI resin.