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L'Eau potable - DVD ONF/NFB

Catalogue Number:  NFB545934
Producer:  National Film Board Of Canada
Producers:  Vincent Paquette
Directors:  Harold Randall
Producing Agencies:  National Film Board of Canada (Ottawa), Office national du film du Canada (Ottawa)
Subject:  Architecture, Documentary, Environmental Studies, Geography, Health and Medicine, Science, Tech/Voc
Language:  French
Grade Level:  9 - 12, Post Secondary
Country Of Origin:  Canada
Copyright Year:  1947
Running Time:  20:00

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An account of how a city's water supply is purified. Each stage of purification in a filtration plant is shown, together with the complex system of underground mains serving all parts of the city. The safeguarding of water supplies on common carriers (trains, ships, aircraft) through regular government laboratory analyses is illustrated. The film closes with a glimpse of developments in the treatment of water supplies, including the addition of fluorine.

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