Reverse Osmosis is the reversal of the natural flow of osmosis, or a water purification technology that uses a semipermeable membrane. By applying pressure to the water solution of higher concentration (the incoming water), the flow of liquid is reversed. Under these conditions, the membrane still rejects the contaminants, but allows the fresh, cleansed water to pass through. The purified water is then stored in a holding tank and the contaminants are flushed away. This process is typically used to remove sodium from the water, but will also remove arsenic, uranium, nitrates, lead and range of other potential contaminants.
For more information about Reverse Osmosis (RO) visit Wikipedia at http://en.wikipedia.org/wiki/Reverse_osmosis and call Affordable Water Treatment to get a solution to your water issue!