Development and testing of modern effective and at the same time safe and environmentally friendly drugs for disinfection in livestock facilities and processing plants - is in the field of view of livestock producers. Resistance of microorganisms to bactericidal substances, polyresistance, the formation of biofilms in the water supply and watering of animals - these are the challenges facing modern science. The effectiveness of disinfectants depends on the complex of active substances, which by their properties show both negative and positive qualities. To improve their stability, bactericidal, detergent action, it is necessary to control them at the development stage. The drug "Biolaid" was developed by the staff of the State Research Institute for Laboratory Diagnostics and Veterinary Sanitary Examination (Kyiv, DNDILDVSE). To study the physicochemical properties of the drug used to determine its organoleptic properties, indicators of corrosion activity, the value of surface tension and acidity. The paper presents the results of studies of physicochemical properties of the disinfectant "Biolaid" based on lactic acid, hydrogen peroxide and lactic acid. In particular, the corrosion activity of the disinfectant "Biolaid" was determined according to current methods, the amount of corrosion losses, the amount of surface tension and acidity. It has been experimentally established that Biolaid at low bactericidal 2.0% concentrations has low corrosion activity relative to the treated test objects, and 2 times lower than the reference disinfectant 2.0% NaOH. In 0.1% concentration lower from 6 to 39 times depending on the material. The surface tension of the working solution of the drug "Biolaid" is 71.47 mN / m In working concentrations, the drug has a pH = 6.2.