An apparatus for the removal and prevention of scale deposition comprising: a generator having a positive terminal and a negative terminal for generating a DC signal between said terminals (1a, 1b); an elongated tubular member configured to be interconnected with a water carrying conduit in an axial manner, having at a first end an inlet and at a second end longitudinally opposite the first end an outlet for the flowing fluid; at least one signal wire being wrapped around said elongated member to form a first coil and a second coil; said wire having a conductor lead (2a, 2b) at its both ends; said first coil and said second coil having successive turns; at least one transistor having three terminals, B, C and E, associated with the generator for ensuring that the signal is non continuous and can be modulated with variable frequency; a resistor; wherein said coils are overlapping each other and are electrically connected to each other thereby forming a center tap; wherein said center tap is electrically connected with the positive terminal of the generator so that a signal is applied to the coils to energize the coils and to generate a corresponding variable electromagnetic field in the conduit; wherein one of said conductor leads of the wire is electrically connected to the terminal B of the transistor via said resistor; wherein the other one of said conductor leads of the wire is electrically connected to the terminal C of the transistor; wherein the negative terminal of the generator is electrically connected to the terminal E of the transistor; wherein said signal energizes said first coil and said second coil to produce an alternating magnetic field in said coils; wherein said transistor is a NPN transistor having a characteristic of low operating frequency whereby it varies the frequency of said magnetic field induced in said first and second coils; wherein the NPN transistor has a heat sink; wherein the successive turns of each of said first and second coil are in opposite direction; wherein the two overlapped coils that are formed on the pipe contain a similar number of turns. a generator having a positive terminal and a negative terminal for generating a DC signal between said terminals (1a, 1b); an elongated tubular member configured to be interconnected with a water carrying conduit in an axial manner, having at a first end an inlet and at a second end longitudinally opposite the first end an outlet for the flowing fluid; at least one signal wire being wrapped around said elongated member to form a first coil and a second coil; said wire having a conductor lead (2a, 2b) at its both ends; said first coil and said second coil having successive turns; at least one transistor having three terminals, B, C and E, associated with the generator for ensuring that the signal is non continuous and can be modulated with variable frequency; a resistor; wherein said coils are overlapping each other and are electrically connected to each other thereby forming a center tap; wherein said center tap is electrically connected with the positive terminal of the generator so that a signal is applied to the coils to energize the coils and to generate a corresponding variable electromagnetic field in the conduit; wherein one of said conductor leads of the wire is electrically connected to the terminal B of the transistor via said resistor; wherein the other one of said conductor leads of the wire is electrically connected to the terminal C of the transistor; wherein the negative terminal of the generator is electrically connected to the terminal E of the transistor; wherein said signal energizes said first coil and said second coil to produce an alternating magnetic field in said coils; wherein said transistor is a NPN transistor having a characteristic of low operating frequency whereby it varies the frequency of said magnetic field induced in said first and second coils; wherein the NPN transistor has a heat sink; wherein the successive turns of each of said first and second coil are in opposite direction; wherein the two overlapped coils that are formed on the pipe contain a similar number of turns.