Phoenix Gravity New Millennium Edition™ filter elements are not designed to remove useful, healthy minerals from your water. Because the natural filtration process leaves essential minerals such as magnesium and calcium in the water, the filter does NOT change total dissolved solids (TDS). So the TDS remains unchanged, but a TDS value says NOTHING about water quality. For more information, read the frequently asked question: "What do the results of a TDS meter say?"
