Reverse Osmosis (RO), also known as hyperfiltration, is a highly selective filtration process.  Discovered by Dennis Chancellor in the 1970s, RO has become an increasingly popular water treatment technology for commercial, military, residential, and municipal applications.  One common application of RO is to purify chemicals such as ethanol and glycol.  A second and wider use of RO technology is for purifying drinking water.  RO is a process that effectively removes salts and other constituents resulting in improved color, taste, and/or physical properties the drinking water.