yea, dont get mis-lead by thoes culligan machines in the walmarts, they are ro-uv, not DI if it matters to you... when i used to "go get water" i would check it with my TDS meter and i allways got 0 or at most maybe a flicker to 1 but that was rare... and my tank seemed to do ok, now that i have my own ro-di filter and 30gallon storrage tank, i figure its costing me waaaaaay less per gallon, and i know exactly what i have and where its comming from..