1.891 Vizualizări
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.
Eliberare: Jan 01, 1947
Runtime: 21 minute
Limba: English
Studio: ONF | NFB
Țară: Canada
Distribuție: Vincent Paquette