Issue 9 of Sustainable Sanitation Practice (SSP) on "Biogas Systems" is now available on the EcoSan Club website.
During the last years a number of biogas systems have been installed as part of sanitation systems. This issue shows successful examples.

• The first paper presents results from a study in Kerala, India, for digesters on a household level.
• The third paper presents first results of a digester constructed in a small village in Morocco.
• The second paper shows the results of a long-term implementation program for biogas systems in Lesotho.