Most of us use fat and oil in the preparation of food, but residual cooking oil, margarine, butter or lard often end up being washed down the kitchen sink, clogging up sewers and leading to blockages. 

Fat, oil and grease stick to the inside of drains and sewers. Over time, this hardens to form a concrete-like material that can block the entire pipe and cause flooding as sewage is forced to escape through manholes and into streets and rivers or, even worse, into homes.

However, it  is easy to prevent this pollution and devastation.