Usually, we use reverse osmosis to filter out contaminants from water, which are not good for human health like lead, dissolved salts, mercury, iron, and calcium. Thus it removes all turbidity of microbes and the dissolved compounds. However, the process fails to remove harmful pesticides and other volatile components and chemicals. These chemicals include Chlorine and Radon. Also, other contaminants that cannot be removed by reverse osmosis are herbicides, agricultural treatment chemicals like fungicides.