The main characteristic of the electrochemically activated aqueous solutions" (ECAAS) is that if they are subjected to unipolar electrochemical influences with certain characteristics, in them occur metastable, i. g. electrochemically activated substances giving them unique ecological, chemical, physical, biological and, in particular, microbiological properties, which all the currently authorized chemicals (biocides, cosmetics and pharmaceuticals) do not possess. The anolyte and has reduced electron activity and pronounced oxidant properties, and the catholyte has enhanced electron activity and reductor properties. Because of their low oxidant content, the anolytes have very little chemical buffering, hence their environmental safety. The qualities of the ECAAS have provided grounds for their broad application both in the human and in the veterinary field, in the military field, the food industry, for the disinfection of ships, wagons, airplanes, etc. Keywords: electrochemically activated aqueous solutions, antimicrobial action.