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Currently you are able to watch "Let's Look at Water" streaming on NFB for free.
Let's Look at Water is available to watch for free today. If you are in Canada, you can:
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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.