Nanofiltration (NF) is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose 
of softening (polyvalent cation removal) and removal of disinfection by-product precursors such 
as natural organic matter and synthetic organic matter.Nanofiltration is also becoming more 
widely used in food processing applications such as dairy, for simultaneous concentration and 
partial (monovalent ion) demineralisation. User will be able to calculate the following:

- Area

-Product salinity

- Brine salinity

- Average salinity

- Numbe