Pure Aqua, Inc. designs and manufactures water treatment systems in addition to seawater RO machines. In January 2011, Pure Aqua successfully manufactured and supplied a seawater RO machine to a major company in Kuwait. The SW-4.7K-504 machine was designed to produce 4,700 GPD at a maximum 40,000 PPM feed water TDS. The machine was selected from our SWC Series. For more information click here: http://www.pureaqua.com/desalination.html