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1. A method for modifying mechanical, electrical, chemical, chemical-physical, microbiological, hydrodynamic, geochemical, geotechnical, and/or superficial properties of an in-flow filtering medium and/or of a fluid contained in the filtering medium, comprising a production, inside the filtering medium, of microparticles, nanoparticles, and/or coverings of the filtering medium containing at least one zero-valent metal by means of an introduction of a first aqueous solution of at least one metal inside the filtering medium and an introduction of a second aqueous solution of at least one inorganic reducing agent inside the filtering medium, wherein introducing the first aqueous solution and introducing the second aqueous solution is without interrupting fluid flow through the filtering medium.
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