http://www.youtube.com/watch?v=9z14l51ISwg&feature=endscreen&NR=1
[Accessed: 23.10.2012]
This informational video, produced by Severn Trent Water, goes through the entire process of centralised drinking water treatment from raw water source to clean drinking water. In the drinking water scheme presented, chlorine is added as a final disinfection step as the water leaves the plant to the distribution network.