How do I compost spoiled food?

Food expires according to configured shelf life and the save's spoilage multiplier, rather than a visible timer on every individual item. The Compost Bin accepts faeces, spoiled food and ash. Allow the input in its filter, then check reservations, retained stock and transport permissions. Every 10 game days, its base recipes convert 1 faeces, 250 spoiled food or 5 ash into 1 fertiliser. Remaining partial batches are rounded up by the code.