Abstract: A method and apparatus for magnetically treating liquids and gases, is described. The fluid is passed along a pipeline having a permanent magnet aligned therewith, and a coil, rounded at each end, is wrapped around both the pipe and the magnet. Magnetic flux is enhanced by providing a diode in each turn of the coil surrounding the magnet and pipe. Optionally, a collector plate may be provided in the coil remote from the pipe.