Patent ID: 6506299
Filing Date: 2003-01-14
Classification: C02F

Abstract:
An apparatus for treating a liquid in a conduit comprising:a conduit for enabling said liquid to flow therethrough, the conduit having first and second ends and being divided into first, second and third portions, the first portion corresponding to the first end and the third portion corresponding to the second end with the second portion located between the first and second portions; a first coil surrounding the first portion of the conduit and wound in a first direction when facing the first end; a second coil surrounding the second portion of the conduit and wound in a second direction which is opposite to the first direction when facing the first end; a third coil coaxial with and surrounding the second coil and wound in the same direction as the first coil, the third coil being electrically connected in parallel relationship with the first coil to form a first group of coils; a fourth coil surrounding the third portion of the conduit and wound in the same direction as the second coil, the fourth coil being electrically connected in parallel relationship with the second coil to form a second group of coils; a diode, electrically connected between the first group of coils and the second group of coils; means for electrically connecting the coils and the diode; wherein current will not flow through the first and second groups of coils when the diode is reversed biased during treatment of the liquid with AC power applied across the first and second group of coils.