Pure Aqua, Inc. designed a brackish reverse osmosis unit for a major company in Canada to use in treating well water. The RO unit was chosen from our RO-200 series to produce approximately 4,500 GPD from a feed of up to 5,000 ppm TDS. The unit has the capability to soften water with Nano filtration membranes supplied with the unit. Most all NF membranes are of a spiral wound configuration.