We developed an innovative technology of electrolysis-cavitation water purification and water treatment in pools. This method belongs to the group of physical water purification methods and its advantage is the absence of the need for costly chemical disinfectants and a degree of water purification from biological and organic pollutants of up to 97–98 %. A typical electrolytic water treatment process, based on electrolysis disengagement of sodium chloride with the formation of reactive sodium hypochlorite, is complemented by the operation of water cavitation disinfection from organic and biological pollutants. Prior to the electrolysis, the cavitation treatment of water in pools reduces by 75‒80 % the degree of its contamination, reduces approximately by two times the need in disinfectant produced by electrolysis installations. This proportionally reduces by 45–50 % the duration of energy-consuming electrolysis equipment operation and reduces by one-third the costs of electricity for water treatment operations.For cavitation disinfection of water in pools, we have devised a new design of an industrial variant of the vibrocavitator with a resonance effect, studied the conditions for disturbing the cavitation processes within it, and developed a procedure for the design and calculation of its main components and parts. The block of vibrocavitators that precedes electrolysis water treatment ensures the oxidation of organic impurities in polluted water, including urea, to 75–77 %. The degree of biological water disinfection in this case reaches 80–82 % with a capacity of 3–3.5 m3/hour.The power of electromagnets in a vibrocavitator drive is 1–1.5 kW, which is an order of magnitude less compared to the power of electrolysis installations. Given this, the proposed phased cavitation and electrolysis water treatment reduces the total energy consumption for a water treatment operation. For standard pools with a water volume of 3,000 m3 with electrolysis water treatment, the introduction of additional cavitation treatment will make it possible to reduce monthly energy consumption for a water treatment operation by about 1,200‒1,500 kW.We have considered the legal aspects for implementing the proposed solutions in terms of the production implementation of the electrolysis-cavitation water treatment process and improving the safety of users of water procedures and services