An apparatus for treating a mixture of fossil fuel and water for use in internal combustion engines, boilers, heating units, gas turbines or any other fossil fuel burning machine, or fuel cells said apparatus comprising: a treatment unit, for treating said mixture of fossil fuel and water, said treatment unit comprising: an inlet for receiving said mixture of fossil fuel and water into the treatment unit, an outlet for discharging a treated mixture of fossil fuel and water from the treatment unit, and an assembly of two or more tubes of a non-magnetic material, said two or more tubes having a circular cross-section, and said assembly being arranged between said inlet and said outlet, said two or more tubes have different diameters, have substantially equal lengths, are arranged in length alignment, and are arranged concentrically with said tubes defining a plurality of intermediary spaces, thus providing a plurality of flow paths for said mixture of fossil fuel and water between said inlet to said outlet, an innermost tube and an outermost tube being electrically connected to an electrical current generator, said electrical current generator is configured for supplying a pulsed current with the innermost tube being connected to a positive pole of said electrical current generator and the outermost tube being connected to a negative pole of said electrical current generator to thereby expose said mixture of fossil fuel and water flowing through said intermediate spaces to an electromagnetic field. a treatment unit, for treating said mixture of fossil fuel and water, said treatment unit comprising: an inlet for receiving said mixture of fossil fuel and water into the treatment unit, an outlet for discharging a treated mixture of fossil fuel and water from the treatment unit, and an assembly of two or more tubes of a non-magnetic material, said two or more tubes having a circular cross-section, and said assembly being arranged between said inlet and said outlet, said two or more tubes have different diameters, have substantially equal lengths, are arranged in length alignment, and are arranged concentrically with said tubes defining a plurality of intermediary spaces, thus providing a plurality of flow paths for said mixture of fossil fuel and water between said inlet to said outlet, an innermost tube and an outermost tube being electrically connected to an electrical current generator, said electrical current generator is configured for supplying a pulsed current with the innermost tube being connected to a positive pole of said electrical current generator and the outermost tube being connected to a negative pole of said electrical current generator to thereby expose said mixture of fossil fuel and water flowing through said intermediate spaces to an electromagnetic field. an inlet for receiving said mixture of fossil fuel and water into the treatment unit, an outlet for discharging a treated mixture of fossil fuel and water from the treatment unit, and an assembly of two or more tubes of a non-magnetic material, said two or more tubes having a circular cross-section, and said assembly being arranged between said inlet and said outlet, said two or more tubes have different diameters, have substantially equal lengths, are arranged in length alignment, and are arranged concentrically with said tubes defining a plurality of intermediary spaces, thus providing a plurality of flow paths for said mixture of fossil fuel and water between said inlet to said outlet, an innermost tube and an outermost tube being electrically connected to an electrical current generator, said electrical current generator is configured for supplying a pulsed current with the innermost tube being connected to a positive pole of said electrical current generator and the outermost tube being connected to a negative pole of said electrical current generator to thereby expose said mixture of fossil fuel and water flowing through said intermediate spaces to an electromagnetic field.