Whole House Reverse Osmosis (RO) removes up to 99.8% of the chemicals in your water. This means that arsenic, cyanide, chrome, copper, nickel and other ions are greatly reduced. In addition, water hardness in reverse osmosis is also removed, which eliminates lime scale formation on bath fixtures, in pipes, and in the water heater. Most water heaters fail due to calcium buildup on the heater elements; reverse osmosis will eliminate that method of failure. With Reverse Osmosis water, dishwashers last longer, and dishes rinse spot free. The scale that builds up on showers and bath fixtures is eliminated. Water tastes better and is better for you.