The manufacturer must ensure that the different stages in production are carried out according to pre-established written procedures and instructions aimed at defining, checking and mastering the critical points in the manufacturing process, such as in corporation of the additive in the premixture, chronological order of production, meters and weighing apparatus, mixer and returns, in such a way as to obtain the desired quality of the premixtures concerned in accordance with the provisions of Directive 70/524/EEC.
