The article presents the results of experimental studies on the study of changes in the concentration of active chlorine in water treated with sodium hypochlorite when exposed to UV radiation and its contact with the concrete surface. The obtained research results are aimed at studying and solving the problem of the absence of residual active chlorine in the most remote points of water sampling in large cities with a large length of water distribution networks.

Keywords: disinfection of water, sodium hypochlorite, chlorination, disinfection, residual active chlorine

Consider the choice of coating anodes for electrolysis of sodium hypochlorite nizkokontsentrovannogo 3% solution of sodium salt of food and water of the Black Sea. Defined corrosion resistance of anodes with different laying oxides of ruthenium and iridium and their characteristics: yield chlorine-current voltage on the cell growth dynamics of the concentration of active chlorine in the solution.

Keywords: oxide coatings, iridium, ruthenium, low concentration of sodium hypochlorite, the corrosion resistance of anodes according to the output current of chlorine, the electrolysis of a 3% solution of sodium edible salt and sea water.