Most of us use fat and oil in the preparation of food, but residual cooking oil, margarine, butter or lard often ends up being washed down the kitchen sink.
These fats and oils collect inside the sewers and over time harden to a concrete-like material and restrict the flow of wastewater in the pipes.
These blockages can cause wastewater to back up through toilets and sinks into homes and businesses or escape through manholes into streets and rivers.
The sewers are only designed to take away the three Ps – pee, poo and paper
Every day our team of operatives work to keep our sewers flowing smoothly. Follow a day in the life of one of our sewer operatives in the film below.