Purolite MB400IND Mixed Bed Color Changing DI Resin ? 44 LBS / 1 Cubic Foot Looking for a high-capacity deionization solution for your water purification system? The Purolite MB400IND 44 LB bag offers a 1 cubic foot volume of premium mixed bed color-changing DI resin, making it ideal for commercial, residential, and aquarium water treatment systems requiring high-purity water output. This resin is specially formulated with a 1:1 volumetric mix of strong acid cation and strong base anion exchange resins. As it becomes exhausted, the resin changes color from blue to amber, offering a clear visual indicator that it?s time to replace it. Key Features Product Code: MB400IND Resin Mix: 50% Purolite C100H (hydrogen form) + 50% Purolite A400OH (hydroxide form) Color Indicator: Turns from blue to orange/amber when exhausted Mesh Size: 16?50 mesh for optimal flow and adsorption Volume: 1 cubic foot (44 lbs) Form: Ready-to-use mixed bed resin Specifications Product Name Purolite MB400IND Mixed Bed DI Resin (Color Changing) Resin Type Mixed Bed (Cation + Anion Exchange Resins) Color Change Indicator Blue to Amber/Orange when exhausted Resin Composition 50% Purolite C100H (H+ Form) + 50% Purolite A400OH (OH- Form) Mesh Size Range 16-50 Mesh Volume 1 Cubic Foot Weight 44 LBS (20 kg) Packaging Sealed Bag Intended Use Deionization / Final Polishing / Spot-Free Rinse / Aquarium / Commercial TDS Removal High (Near 0 ppm when fresh) Compatible Systems Standard Mixed Bed DI Filters, Aquarium Systems, Spot-Free Rinse Tanks When to Replace When the resin changes color from blue/black to orange, it's time to replace the contents. Regular monitoring with a TDS meter is recommended to ensure peak performance.