20" x 2.5" DI Filter for aquarium and other applications where 0 ppm is needed.
Nuclear grade with color indicator: for production of demineralized water of high purity, silica free. When the resin is used up, the color resin will change either from green to dark brown color or from light brown to dark brown / off black color. (Depending on the batch supply, the original color ranges from green to light brown. This is common with all suppliers in the industry.) It will give you 0 ppm TDS, Conductivity attainable less than 0.1uS/cm or resistivity of close to 18 meg.ohm