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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?

Making more biogas

136. As with your old biogas unit, the easiest way to make more gas is to build one or more small units and get gas from them all.

137. If you can get more oil drums, pipe, T- pieces, valves, inner tubes and gas lines, and if you have enough time, you can build and run more units.

138. The drawings below show you how to connect several units to the same gas line with T- Pieces.

T- piece

139. As you have already been told in Booklet No. 31, when you have several biogas units, fill them with waste at different times. That way, when all the gas in one unit has been used, you will get gas from another unit that is still working.