1.439 Vidoj
This short documentary shows how a city's water supply is purified at a filtration plant. The complex system of the underground mains that supply all parts of the city with water is also illustrated, as is the safeguarding of water supplies on trains, ships and aircrafts.
Liberigo: Jan 01, 1947
Rultempa tempo: 21 minutoj
Lingvo: English
Studio: ONF | NFB
Lando: Canada
Rolantaro: Vincent Paquette