The tap water in our area is about 200 ppm and tastes like a bad chemistry experiment so we had to do something.  I used to buy bottled water but didn't like the dangerous residue from the plastic, or the additional pollution it causes.  Discovering Zero Water was a breath of fresh air...or rather, a drink of fresh water.  The first time we tasted pure water we knew we had made the right decision.  We purchased two of the 12 cup pitchers and just keep them rotated throughout the week.  They are quite convenient and easy to use.  While the filters aren't cheap, it certainly pays for itself over the long run, without the guilt of dumping a bunch of plastic bottles into the landfill.  And the water (and everything you make with water) tastes SO much better.