Aquatic Life Twist-in Mixed-Bed Color Changing Deionization Resin Filter Cartridge

From the brand

COLOR-CHANGING DEIONIZATION RESIN – The Mixed-Bed Deionization Filter Cartridge contains positive Cations and negative Anions. DI Resin physically changes color from Blue to Tan when depleted.
REDUCES TOTAL DISSOLVED SOLIDS TO ZERO – The deionization resin is necessary to reduce Total Dissolved Solids (TDS) to zero in the final stage of an RO/DI system. It uses ion exchange to remove TDS from water.
SIMPLE TWIST-IN DESIGN – The twist-in deionization filter cartridge is designed to simply Twist-In” to the pivoting head on the Aquatic Life 75 and 100 GPD Models of the Twist-In RO and RO/DI units.
TRANSLUCENT LOWER FOR EASY VIEWING – This di filter cartridge has a translucent lower polyethylene housing for easy viewing of the resin to know when it’s time to replace the cartridge.
UNSURPASSED QUALITY AND SATISFACTION – AquaticLife manufactures an assortment of aquarium and water filtration equipment. Every product that goes out the door meets our highest quality and standards.