The North Regional Water Treatment Plant has been designed to utilize a membrane softening process to remove undesirable constituents from raw water supply. As designed the facility is capable of treating 13.3 M.G.D with a 90% recovery rate, producing12 MGD of high quality treated water. Raw water is pretreated with sulfuric acid and scale inhibitor are fed into an inline static mixer upstream of the Facility's 5 micron cartridge prefilters. The pretreated water is then piped to the indiviual membrane trains. High pressure pumps located at each train boosts the raw feedwater supply pressure from and average of 20 p.s.i to approximately 150 psi providing the driving force to overcome the osmotic pressure. Water that has passed through the membrane is referred to as permeate. Permeate is collected and piped to the degasifiers for further treatment. The minerals removed by the membranes are contained in a concentrated solution called concentrate or reject. The solution is pumped into one of the Department's two deep injection wells to a depth of approximately 3,100 feet.