https://www.youtube.com/watch?v=cabw8enOC8Q
T.H Culhane, BioGas expert, shows the 5 different BioGas digesters at Tamera, and how to make them. Filmed during the 5 day BioGas course at Tamera Community in Portugal.
http://www.tamera.org
http://solarcities.eu
Filmed By Serena Aurora April 2015
https://auroraseye.wordpress.com