Measurement of chlorine levels

The measurement of free chlorine levels can be done manually using test strips, colour kits or indirectly using portable ORP meters which read in mV. In establishing a chlorination system, these measurements are made and the dosing rate of chlorine adjusted until the desired free chlorine levels are achieved at the location being measured.

Alternatively this can be done automatically using electronic sensing and recording equipment (ORP/mV) which may include feedback to the dosing pump and/or low chlorine level alarms. These systems provide the flexibility to accommodate sudden changes in water quality, for example after heavy rain or dramatic changes in inflow water requirements. They also allow the immediate detection of chlorination system failures and reduce the window of opportunity for birds to receive untreated surface water.