Conducted a search for deionization units and found these: Deionizer Products: Mixed Bed, Dual Bed, Tri-Bed Deionizers | On The Go® This page shows a chart which indicates the potential output based upon the amount of TDS present in your water. Deionizer Technology | On The Go® Has anyone utilized a unit similar to this? Seems a little more economical compared to the CR Spotless systems. However, its difficult to be sure since I was not able to locate a chart which correlates output expectancy and TDS in regards to CR Spotless. Let me know.