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If I am enlisting my waste in the output process, is it necessary i add a minus sign for my wastewater or waste polyethylene?
in openLCA by (240 points)

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ago by (115k points)
good question, this depends on which type you give to these flows, waste, or product: for product flows, use a minus (and remember to use a minus where these are treated as well), for waste flows, do not use a minus. Modeling with waste flows is typically easier, more intuitive and avoids some common mistakes (as: forgetting a negative sign somewhere).