Pure Aqua, Inc. designs and manufactures water treatment systems in addition to double pass seawater reverse osmosis systems. In November 2012, the double pass seawater reverse osmosis system was delivered to a major copper mine in Chile. The system came complete with pretreatments consisting of a prechlorination, a multimedia filter, dechlorination, and an antiscalant chemical dosing system. The SW- system was designed to produce 12,000 GPD at a maximum 36,000 PPM feed water TDS from which the product will feed another pass RO system with will produce 9,000 GPD. For more information click here: http://www.pureaqua.com/industrial-seawater-reverse-osmosis-swi-series.html