The invention relates to the field of cavitation treatment of liquid media and also of media in which the specific content of water or another liquid phase exceeds 30-35 % of the total mass. The method consists in placing containers of liquid media in a working fluid in a rectangular bath. The material of the liquid media-filled containers has a specific acoustic resistance equal to or approximating the specific acoustic resistance of the working fluid. A standing acoustic wave is created in the working fluid from all walls and the base of the bath, which are designed as flexible membranes having their own first harmonic resonance frequency. The length (a) and width (b) of the bath are chosen as multiples of one quarter of the length of the wave created in the working fluid by the side walls of the bath. The height (h) of the working fluid level is chosen as a multiple of one quarter of the length of the wave created by the base of the bath. The method enables the effective, simultaneous treatment of a plurality of different or identical compositions of liquid media, each of which is situated in its own container. Specifically, the method may be advantageously used in the preparation of individual cremes with a sub-micron size dispersion phase.
