Otayo Membrane RO Water Purifier Inj Aqua Drop, The Water Is Passed Through RO Membrane At High Pressure. RO Membrane Removes Hazardous Chemicals Such As Pesticides, Herbicides, THMs Heavy Metals, Hardness & Other Salts From Water. It Also Removes Bacteria Virus, Protozoa And Protects You From Microbiological Threats.