Abstract: The present invention relates to a novel forward osmosis (FO) process for dewatering of a variety of feed solution using low water activity and high osmotic pressure deep eutectic solvent with and without dispersed magnetic nanoparticles as draw solution. In particular, choline chloride-ethylene glycol, choline chloride-glycerol, Fe3O4 dispersed in former and latter were utilized as draw solution in FO for one step desalination of brackish and seawater, water recovery from effluent of leather and dye industries, protein and DNA concentration at room temperature. Owing to very low freezing point, the diluted draw solution after FO was recovered through phase separation by chilling at Ca. ?10 ° C. with concomitant production of usable water. Although the present invention focused on specific DES and dispersion of Fe3O4 as magnetic nanoparticles but use of other DES having high osmotic pressure and low freezing point and other magnetic nanoparticles dispersion are logical extension of present invention.