Our NEO RO Water Purifiers enhance RO+UV+Tds Controller with Added Minerals [Ten Stages Purification] is equipped with a multi-stage unique Reverse Osmosis purification process, to give you pure, fresh water. Reverse Osmosis is a membrane filtration process in which the water is passed under high pressure through an advanced Thin Film Composite (TFC) Membrane, with a 0.0001 micron pore size. The output of the membrane is purified water, free from microorganisms and with reduced Total Dissolved Solids.