FRP RO Plant is a process to remove dissolved solids and impurities from water using a semi-permeable. The Ro Membrane requires water to be under high pressure to pass water. The water that passes through the Ro Membrane is called to as the “permeate (Product)” and the dissolved salts that are rejected by the RO Membrane is called to as the. “Reject (Concentrate)”. A properly run RO System can remove up to 99.5% of Incoming Dissolved Salts and impurities.