A project I'm involved with requires treatment of saline waters at approximately 10 ppt salinity. Pre-treatment will remove Ca and Mg, suppliers recommend 2 stage RO to produce maximum make water, minimum brine. However, its difficult to believe that from 60 m3 per day of above water can be treated to yield more than 60% water under 2,000 ppm TDS. Without getting into commercial discussion, is Dow membrane technology the best?