37For that purpose, the Member States must, in particular, as is clear from the second sentence of Article 18(1) of Directive 2009/28, require those economic operators to use a ‘mass balance’ system which must have certain characteristics, which are set out in points (a) to (c) of that provision. In accordance with those points, such a system must therefore, first, allow consignments of raw material or biofuel with differing sustainability characteristics to be mixed, secondly, require information about the sustainability characteristics and sizes of those consignments to remain assigned to the mixture and, thirdly, provide for the sum of all consignments withdrawn from the mixture to be described as having the same sustainability characteristics, in the same quantities, as the sum of all consignments added to the mixture.
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