Having optimised the free-chlorine pH control conditions within a channel, under quiescent conditions, the effect of flowrate was investigated. The microfluidic system was connected to a digitally programmable syringe pump to permit quantified flowrates through the channels. All CV parameters remained the same as the static conditions described above, except for the protonator bias, which was increased by 100 mV to 1.7V. This voltage increase was to drive a higher protonator current to offset the hydrodynamic removal of some of the generated protons by flow which was observed to decrease the efficacy of the pH control. By generating extra protons, the pH was shifted back to the desired pH within the vicinity of the sensors; despite the effect of flow. Cleaning scans were again performed between each set of measurements.