We understand that the carbon added to the bin may be wood chip, cardboard or paper. Is there any specific types of wood chip that must be used or can’t be used?

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Any carbon based material is fine. The BIGGEST consideration is that it needs to be dry! Wet material will eventually flood the system.

How are the bins emptied while still attached to the pipes?
Are there precise ratios of carbon : waste required? Or is It sufficient to put enough carbon to cover the dead animals, whatever that amount may be?