The magnetic iron nanoparticles are used as an original nucleus of infiltration system for removing pollution from subterranean waters and industrial wastewaters. In this project we are used these nanoparticles for removing nickel pollution. two different experimental methods have been done. In the first method, nickel solutions are mixed with different values of iron nanoparticles and then the mixture is exposed to radiation waves. In certain times, magnetic particles are separated from solution by the external magnetic field and the residual nickel is determined by atomic absorption spectrophotometer. The results show that iron nanoparticles have high efficiency for removing nickel from the water. So that 0.03 g iron nanoparticles can be removed about 13-25 ppm of nickel ions. In the second step, separation has been done by osmosis phenomenon. An osmosis system containing aqueous Ni(II) solution, iron nanofluid and a permeable membrane is designed. In this state, experimental conditions are modified to obtain maximum transfer of water from Ni solution via membrane. Finally, the nanoparticles are separated from water by magnet and pure water is produced.