Pure Aqua, Inc. designs and manufactures water treatment systems in addition to reverse osmosis systems. Reverse osmosis specializes in the desalination and removal of impurities from water using pressure and semi permeable membranes. This particular equipment was completed in May of 2013 and put to use in California on municipal tap water. Both reverse osmosis systems included an activated carbon filter. For more information click here: http://www.pureaqua.com/water-makers.html