A mechanical, continuously variable flow control system (with 3 positions: low-standard-high), allows users to adjust the water flow rate. For example, if the water pressure is too high, it can be quickly adjusted by turning the external switch. The flow rate affects the pH of ionized water: if the pH is too low, this may be due to excessive water pressure. By turning the switch controlling the water flow to the "Low" or "High” position, the process of ionization is, in the first case, increased, and in the second, decreased; this usually results in a corresponding increase or, instead, a reduction of the pH value. The flow rate setting is shown on the LCD display; this allows users to optimize settings thereby obtaining a constant pH.