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RE: Taking Care of Business – Methane Digesters
You're certainly right... but I guess you'd have to compress it for storage, which requires energy. That, however, can be done in a sustainable way, so in the end it may be worth it.
I know the home bio gas system uses water or sand to compress the bag. You should definitely look at their system. I'm just having a hard time figuring out how to do it myself not having access to the materials they do