The method is based upon the use of impressed current on copper and aluminium anodes which are themselves contained within an insulated steel frame which forms the cathode. The anode/cathode electrode unit is suspended from the pump motor base within the confines of the caisson so that all the water entering the pump must pass the electrode unit. The system consists of two parts – the electrode unit and control panel. The electrode contains a number of copper and aluminium anode bars held together in a steel frame to form the cathode.
The actual number and size of the anodes is configured to suit each installation and available space for mounting the electrode unit. The anodes are connected to the constant current rectifier located within a safe area. The control panel is designed to regulate the anode currents in both ‘pump on’ and ‘pump off’ condition, so that during the pump standby condition an atmosphere of copper ions in the local environment will maintain the pump free from fouling.
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