When I moved to Tucson, AZ from Denver, CO I was immediately aware of how bad the local city tap water is.  I do a lot of my own cooking and also use water for drinking, making beverages and ice. I even had the water tested by a local firm, and sure enough the tap water is super high in dissolved solids, the PUR and Brita systems do not reduce any of this in normal use, and will clog quickly by trying. Even though the filter replacements for ZeroWater are more money, this is the only system worth using, period! Especially if you want to avoid buying bottled water. This system produces excellent water quality every time....just make sure to replace the filter once the reading is 006 or higher.