A system to prepare an antimicrobial solution by the electrolysis of brine is presented where the antimicrobial solution is a solution comprising HOCl that contains a HOCl concentration in excess of 500 ppm or more at a pH of 6 to 6.8 with a low residual salt concentration and displays a stability in excess of 60 days and can have a HOCl concentration in excess of 450 for 180 days. The system includes an electrolysis cell that is improved by a superior anode and ceramic membrane such that when employed with a DC power supply controlled by a microprocessor and a controlled brine concentration provided to the cell at ambient temperature at a controlled rate, delivers a fluid that is continuously monitored by a pH probe and an ORP probe for input to the microprocessor.