Pure Aqua, Inc. designs and manufactures water treatment systems in addition to high brackish reverse osmosis machines. This machine was produced for a company in Yemen and sent there upon completion in June 2013. This high brackish reverse osmosis machine gets a feed of well water at approximately 4,500 ppm tds and is designed to produce 130,000 GPD. Along with the efficient reverse osmosis portion are four chemical injections used to further purify the product water. For more information click here: http://www.pureaqua.com/custom-water-treatment-systems.html