The raw water enters the Works from UPWRP through the intake chamber into the bandscreen chamber. Large suspended solids and debris of sizes greater than 4mm are removed with the help of bandscreen equipment.

The water then flows into the raw water pump sump where it is dosed with sodium hypochlorite solution. This process, known as pre-chlorination, helps to suppress algae and bacterial growth on the surfaces of downstream units thereby reducing the amount of maintenance work required to keep these units clean. Caustic soda is also dosed when necessary to maintain the desired pH level as acidic raw water will cause erosion problems to the downstream units.

After pre-chlorination and pH correction, the raw water is pumped to the clarifiers via the raw water pumps. At the clarifiers, the raw water is dosed with chemicals called aluminium sulphate (Alum) to bring about the coagulation, flocculation and sedimentation of the suspended solids in the raw water. The primary purpose of chemical clarification is for the removal of suspended solids and reduction of phosphates. The coagulated and flocculated suspended solids that settle onto the clarifier plates are

The clarified water from the clarifier flows by gravity into the sand filters where the remaining fine suspended solids are removed. Filter beds are regenerated regularly by means of backwashing using industrial water. The suspended solids that are trapped on the sand filters are then desludged into the sewer.

The filtered water is then sent by gravity to the cascade aerator to increase dissolved oxygen in the water.

In the digesters, another culture of micro-organism thriving in an oxygen-deficient environment breaks down the organic substances in the sludge. The sludge is allowed to remain in the digesters for 20 - 30 days. The digestion process converts the organic matter into biogas which contains 60 - 70% methane. The biogas is then used as fuel to power dual-fuel engine generators which helps contribute to the electricity energy required at the plant.

This is the final stage of the treatment process. The filtered water is channelled to the treated water tank where sodium hypochlorite is dosed to disinfect the treated water.