Activated solutions (catholyte and anolyte) are used for disinfection and growth of vegetable plants. To water vegetable plants with catholyte and disinfect them with anolyte, the authors have designed a single-phase fl ow-through electric activator consisting of two symmetrical chambers – that of a cathode and an anode type. The capacity of each chamber is 25 l/h. At the rated operating mode of the electric activator the change in the hydrogen index of water consumed is 3.5. The authors have determined design parameters, electrode spacing, electrode resistance, temperature increment in the cathode chamber, current and power consumed by the electric activator for these conditions. Using a three-factor experiment, they have determined optimization criteria: electric activator capacity, its productivity, and operating cycle. The obtained regression equations adequately describe the process of liquid ac tivation in the electric activator and determine the eff ective modes of its operation. It has been experimentally established that effi ciency of water electro-activation process is determined by the value of change in hydrogen index of the activated solution, loss of voltage in the electric activator chamber, and current density determined by the capacity, productivity, and operating cycle of the electric activator.