a continuous supply that does not bring air:
you can connect the exit of a grating on which would be put cows, cleaned with water (it takes 50% for the biogas), or the exit of BIO latrines:
otherwise in closed tank there is this:
beware of the oil drums, they are drilled on the side (1 ton of oil gives 200m3 gas! voila how to store the used oil recyclers ;-)
the demo link:
it will gass!
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