Abstract: Disclosed are a disinfectant based on an aqueous, hypochlorous acid-containing solution, especially in the form of an electrochemically activated, diluted water/electrolyte solution, as well as a method for producing such a disinfectant. In order to increase the stability of such a disinfectant also in case the disinfectant has a large surface, e.g. when the disinfectant is applied to surfaces, the disinfectant further contains a certain percentage of amorphous silica (SiO2), particularly in the form of amorphous silicic acids and/or amorphous silicic anhydrides. Said percentage can be selected especially in such a way as to increase the viscosity of the aqueous solution to the point where the solution gels. The invention further relates to the use of such a disinfectant.