n 4 ppm (parts per million) TDS, the lowest TDS ever measured for natural (untreated) water. TDS COMPARISON CHART (ppm) Isbre Dela Bur) 4 28 IceLand Sprng 42 Crystal Springs 44 Poland Spring 54 Voss 64 Deer Park 72 Vermont Pure 72 Icelandic Glacial 74 Trump Ice 74 Ice Mountain 76 sarat