Product review (2 stars): Doesn't do much to the water.  Only a 15% reduction in total dissolvable solids
We have a TDS meter which measure total dissolvable solids in water.  We got it with our Zero Water pitcher which we love.  Our tap water in LA is a 275 TDS, Zero Water at 0 TDS, Britta is at 175 TDS, GE MWF Filter at 245 TDS.  It almost useless.