1.25lb Color Changing Nuclear Grade DI Resin.
We recommend the color changing resin because it gives you an idea of when to start checking your TDS meter more often. We vacuum pack our resin, this removes virtually all of the carbon dioxide within the package itself. The resin changes from blue to tan as it runs out. The color indicator in DI resin is only a visual indicator of when the resin is near depletion and should not be relied upon and an accurate representation of when the resin is completely depleted, can often be good for much longer. We highly recommend using online TDS meters to definitively tell you when it’s time to change your resin.