Water treatment with electrolysis was performed in a specially made electrolytic cell consisting of TinO2n-1 containing ceramic anode and stainless still cathode. In order to clarify the impact of different halogen ions to the electrolysis process, the model solutions containing Cl-, Br- or J- ions with the initial concentration 1 mmol/L and at equally condition (j = 8,3 mA/cm2, pH 7± 0,2, to = 25oC) were electrolysed. The possible impact of the electric current on the water quality and microorganism reproduction was determined by making model system solution with the same concentration of sulphate ions (SO42-). It was determined that such ions as SO42-, Cl-, Br- or J- presence in the solution call up increasing pH of the solution during of electrolysis process from pH 7.0 to 10.4, due to the reaction of the hydrogen ions which are discharged at the cathode. In the presence of the SO42- ions during the electrolysis process the oxidation – reduction potential of the solution decreases from +250 mV till -135 mV, due to transition of the compounds existing in solution from oxidation form into reduction form, but in the presence of halogen ions (Cl-, Br-, J-) the oxidation – reduction potential of the solution increases till +600 mV, what is defined by the releasing of halogen at the anode. The changes of pH and oxidation – reduction potential during the electrolysis process are greater with increasing the concentration of ions, because due to it the amount of side reactions at the electrodes decreases. It was determined that electrolyse the solution with different initial concentrations of halogen ions, the amount of released halogen increases with extending the time of electrolyses and increasing the ion concentration of halogens. In order to clarify the impact of the electrolysis process on the microorganism reproduction in the water, Pseudomonas fluorescens and E. coli bacteria was use. Using the TinO2n-1 electrode in the electrolysis process with the presence of chlorine and bromine ions can create a lasting disinfectant effect that was demonstrated by the sharp decrease in the number of Pseudomonas fluorescens bacteria colony forming units in electrolysed solutions. Using the TinO2n-1 electrode in the electrolysis process with the presence of iodine ions can create a bacteriostatic effect for Pseudomonas fluorescens bacteria which was maintained for at least 8 days in electrolysed solutions. The SO42- ions practically do not effect on the process of disinfection of water treated by electrolysis. Kinetics of disinfection with electrolysis was studied of solutions containing chlorine ion in water sample which was treated with 0.02 A at chlorine ion concentration of 6.8 mg/L. Viability of the bacteria E.coli was determined by assistance of modified DVC and FISH methods. After the sample was exposed to this concentration E.coli concentration decreased rapidly following exponential decay rate. After about 15 minutes of exposure no culturable or able-to-divide E. coli was detected in the sample. Using the TinO2n-1 electrode in the electrolysis process with the presence of chloride ions, in concentration range which is common in raw waters, can create a level of active chlorine that kills more than 99% of E. coli within 15 minutes. A practically applicable simple model for prediction of disinfection efficiency with electrolytic cell has been proposed.