Abstract It is noted that one of the fundamental questions in the magnetophoresis problem, namely, the determination of the magnetic susceptibility of ferroparticles χ remains poorly understood. This question is of the most importance for “different-kind” ferroparticles contained in processing media in the form of impurities. It is pointed that the approaches to the determination of χ have not been adequately studied and that there is an opportunity of implementing the approach based on the data on the magnetic susceptibility of a disperse specimen χ with a disperse phase of particles to be studied provided that the following rules are observed. First, in addition to obtaining data on the specimen χ (experimental data; for a necessarily small-volume specimen the ponderomotive method is advisable), the volume fraction of the ferroparticles in the specimen γ shall be known. Second, “rigid” specimens, in particular, in the form of powder shall be used. The use of colloidal or suspension specimens shall be avoided because of the unobstructed movement of ferroparticles leading to the formation of their chains and aggregates, which disturbs the condition of the specimen. Third, in order to provide sufficiently long distances between the ferroparticles and to eliminate their mutual magnetic effect, their concentration in the specimen shall be low (γ ≤ 0.15–0.2). At these values of γ the concentration dependences of χ are fairly linear; therefore, values of χ can be determined as χ = χ /γ. Fourth, it shall be taken into account that in the post-extreme (for the susceptibility) range of the magnetic-field strength H = 120–700 kA/m the dependence of the susceptibility χ on the magnetic-field strength has the exponential form: χ ∼ H - 0.75 . This makes obtaining an extended experimental-calculation strength dependence of χ easier provided that a single control value of χ is known. Fifth, the same is also true for the “affined” dependence of the susceptibility of the particles themselves χ on the magnetic-field strength, namely, χ ∼ H−0.75. The approach described in this work has been sufficiently substantiated using concentration and field dependencies of χ for various powder specimens (with magnetite particles, ferroimpurities of sugar and wheat farina, condensate, ammonia, ammonia aqua, circulating water, steam, etc.).