PLEASE NOTE: The above removal rates are calculated after the reverse osmosis membrane alone. After the reverse osmosis membrane this system's water passes through its final polishing filter stage leaving you with 95-98% purity for pennies on the dollar. The above table depicts the most common water contaminants and their removal rate percentages. The reverse osmosis membrane is not limited to removal of the above listed contaminants as the reverse osmosis membrane will remove a much wider range of contaminants other than those listed above.