Water treatment in the UK
An explanation of how water is cleaned and returned to the sea before evaporating and re-entering the water cycle. The reporter visits a water treatment plant to see the process of cleaning the water, to be returned to rivers. A digital animation shows the journey of the River Derwent into the River Trent and the Humber Estuary at the sea. The water cycle is explained. The report finishes with an explanation of evaporation from the sea.