Smart Reef 10" Nuclear Grade DI Replacement Cartridge

Standard 10 x 2.5" Refillable DI Cartridge with screw on bottom + 1.25 pounds of Smart ReefTM +DI (Nuclear Grade DI Color Changing Resin) Quit throwing away cartridges and money. Buy one refillable cartridge and then just buy replacement di resin. Can also be used for carbon and other granular media. Smart ReefTM +DI (Nuclear Grade DI Color Changing Resin) 1.25 lbs of Resin sealed in a mylar bag to prevent prematurely depletion. +DI resin color changing is obvious to see. It changes from blue to brown. Some other color changing resins just change shades of color and are hard to determine when they are depleted. Once the color starts to be mostly brown, use a TDS meter to determine when it is time to change.