The paper focused on study of influence magnetic water treatment (MWT) mechanism on physicochemical properties of aqueous solutions taking into account nature of changes in kinetics of chemical reactions. The theoretical analysis of the magnetic field geometry in the hardware equipment of water purification technologies was used. A review of current data on physicochemical processes was carried out for the processes of the influence of magnetic treatment on the properties and structure of aqueous solutions. The determination of the basic mechanisms of MWT was done taking into account the influence of a non-uniform magnetic field on the librational fluctuations of water molecules, followed by their destruction and disruption of the ortho-para ratio towards more chemically active water molecules. The resulting formalized model makes it possible to explain the nature of the complex effects reorganized after exposure of a non-uniform magnetic field to aqueous solutions. Subsequently, this model can be used to optimize the parameters of the mode of the process of water preparation and water purification.