Abstract: The present invention relates to an apparatus for removal and prevention of 5 scale deposition comprising SMPS (switched mode power supply) (1) for generating DC signal, retrofittable pipe section (3) being fitted in residence water carrying pipe wherefrom the scale is removed or prevented to be deposited, a signal cable (2) being wound around the pipe section (3) to form overlapped coils of optimum turns being connected by center tap (2c), a 10 transistor (4) of low operating frequency electrically connected with signal cable (2) at center tap (2c) formed between overlapped coils. The conductor lead (2a) and conductor lead (2b) are respectively connected to the terminal Band C of the transistor (4). By said configuration, when the signal is applied to the signal cable (2), an alternative electromagnetic field with variable 15 frequency is induced around pipe that effectively removes and prevents the scale forming through the water passed from said conduit.