Nano filtration is a technique that has succeeded in the course of recent years which is used most often with low total dissolved solids water such as surface water and fresh groundwater. Divalent and larger ions are generally targeted to be removed by Nanofiltration. Monovalent ions pass through Nanofiltration membrane so it is widely used for desalting application. Removing hardness and dissolved organics from water, arsenic removal from drinking water, heavy metal ions recovery from electroplating wastewater and separation of pharmaceuticals from fermentation broths are some of the examples of industrial applications of nanofiltration. NF has properties that lie between Ultrafiltration (UF) and Reverse Osmosis (RO) with pore size of 0.01-0.001 µm. Since all NF membranes have their origins in reverse osmosis (RO) membranes, they are called loose reverse osmosis membranes or tight ultrafiltration membranes with respect to its permeate flux and separation performance.