Abstract: A process and a device for the magnetic treatment of fluid as the fluid moves in successive magnetic fields, including a sheet having adjacent transverse bands each of the same width. Each band is charged with magnets oriented alternatively NS/SN or NNSS/SSNN perpendicularly to the plane of the sheet so that successive transverse bands adjacent to each other present upper polar faces alternately having polarities S, N, S, N . . . S,N or S,S, N,N, S,S, N,N, . . . S,S, N,N.

Abstract: A device for separating particles from a liquid to be treated is disclosed. The device has a cylindrical enclosure with an inlet for creating a swirling flow at its upper end and an annular channel formed by a flow diverter plate leading to a retention chamber at its base. The flow diverter generates an ascending swirling flow of treated liquid which is discharged through an axial outlet tube in the uppermost portion of the enclosure. The flow diverter includes at least one plane central section and means for adjusting its longitudinal position to adjust the annular channel. The axial outlet tube is extended downwardly by a flow adjusting element to create a flow of annular section.