Dalhousie researchers use LED light on municipal sewer system
Powerful LED light is being used to kill viruses and bacteria in a municipal sewer system. As Brett Ruskin reports, it's being led by a team at Dalhousie University in Halifax.
10:01
1:34
3:30
2:02
2:03
1:36
1:57
5:59
3:31
1:20
