Introduced by a doctor.
Each person in Britain consumes about forty gallons of water a day; water that is used in homes, schools, offices, and in industry. The purification of water on such a scale sets problems that science can help to solve.
This programme traces the story of a glass of water from a river source through storage, purification, and distribution, to the kitchen tap.
( first shown on May 11)
(to 11.45)