Abstract: A method and an apparatus for the modification of seawater, brine, or alike, to render it suitable for irrigation, industrial use, or for further treatment in a drinking water purification plant, as well as to extract desired substances from brines, such as boron, and to clear waste from mining processes, by reducing environment endangering contaminants, like petroleum hydro-carbons, or radioactive substances, as well as inactivating microorganisms and virus in biosolids, by means of exposing the substances to high-intensity macrosound, i.e., alternating mechanical energy radiation at (ultra-) sonic frequencies. The treatment enhances the separation of salt, or/and other desired materials, from the water, and activates in situ the adsorption of the materials on sorbefacient substances supplied to the desalination process in form of dust of pulverized, liquefied, or vaporized substances, or by elements (of walls) of treatment chambers, or filters.