Where can I see the biosand filter videos?

The English version of the biosand filter videos can be seen on youtube:
https://www.youtube.com/watch?v=icLOgAkofUk&list=PL9v91TA8WG-bNNQR2TKqxdi3zTrCGEa0U

To see other CAWST videos, such as webinars or links to videos on water, sanitation, or hygiene made by other organizations but which we like, visit CAWST's youtube channel here: 
https://www.youtube.com/channel/UCSN24sOUXbvLWlJcvm-F_2w