Tour Stop 5: Reverse osmosis process
In this process, high pressure forces the treated water through tightly wound sheets of thin membranes with pores so small that a water molecule is almost the only substance to pass through. Reverse osmosis (RO) removes contaminants, viruses, pesticides, salts and most contaminants of emerging concerns, such as pharmaceuticals, personal care products and pesticides, producing highly purified water. This is the same process that is used by some bottled water companies, baby food manufacturers and for kidney dialysis. There are 240 RO pressure vessels currently installed that will produce 8 million gallons per day of high-quality water.