An electrolysis system for the production of electrolyzedwater is detailed. The system comprises a reservoir 2 comprising an aqueous electrolyte solution and an electrolytic flow cell 4 in fluidcommunication with the reservoir 2 to receive a feed stream comprising the aqueous electrolyte solution. The cell 4 comprises a plurality of boron doped diamond (BDD, BDE) electrodes, in which the electrodes are connected to a power supply 11, operable to provide an over-potential to the electrolyte solution to produce an electrolyzed water feed stream. A control system 8 is also provided which is operable to control the power supply 11 in dependence on the salt concentration of the electrolyte solution to provide a predetermined voltage to the cell 4. The predetermined voltage corresponds to the minimum voltage required to provide an optimum concentration of active species in the electrolyzed water
