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		Better Farming Series 32 - Biogas 2: Building a Better Biogas Unit (FAO, 1986, 47 p.)
			(introduction...)
			Preface
			Introduction
			How to build a better small biogas unit
			Putting in the waste
			Time
			Temperature
			Scum
			When the gas is made
			Taking care of your biogas unit
			Making more biogas
			What more can you do?

Time

104. It may take up to three weeks or even a month for the waste in your new biogas unit to begin making gas. After that, the unit will continue to make gas for about eight weeks.

105. During these eight weeks half of the gas will be made in the first two or three weeks and the rest in the last five or six weeks.

106. If you find that too little gas is being made in the last weeks empty the unit and start again.