A granular activated carbon / phosphate cartridge for scale prevention and chlorine/chemical reduction.
Granular Activated Carbon with 8 ounces of polyphosphate. This is a good taste/odor cartridge that protects equipment (coffee machines, icemakers, etc.) from scale formation. Works best at low flow rates. Phosphate does not remove hardness minerals in water but "sequesters" them so that they do not damage metal surfaces.