Pure Aqua, Inc. designs and manufactures water treatment systems in addition to RO water filtration systems. In May 2011, Pure Aqua, Inc. designed and manufactured an RO water filtration system to a major company in TX, USA. The system came complete with pretreatments of an activated carbon filter and a twin alternating water softener. The TW-7.5K-540 system was designed to produce 7,500 GPD at a feed water TDS of a maximum 500 ppm, it was chosen from our RO-200 series and was controlled by a microprocessor control panel. For more information click here: http://www.pureaqua.com/commercial-reverse-osmosis-systems-ro-200-series.html