A method for separating a dry or dried infill having a composition of materials, preferably comprising rubber and sand, into a plurality of fractions, comprising the steps of: (a) providing a dry or dried infill; (b) taking out a sample of the dry or dried infill; (c) pre-analysing the composition of the sampled dry or dried infill so as to obtain a first set of composition values corresponding to the composition of the infill, said pre-analysis comprising the steps of (i) separating the infill into a plurality of analysis fractions based on particle size and/or specific gravity by a pre-analysis unit, and (ii) determining the relative content of each separated analysis fraction in relation to the total content of analysed infill; (d) providing at least a first screening means configured to receive at least a first set of separation screens, the at least first set of separation screens being configured to separate the infill into the plurality of fractions; (e) comparing the first set of composition values of the dry or dried infill with a plurality of second sets of composition values of a database, each second set of composition values corresponding to a composition of materials and to a predetermined second set of separation screens, so as to obtain a correlation coefficient and/or deviation value between the first set of composition values and each of the plurality of second sets of composition values from the database; (f) selecting the at least first set of separation screens to be received by the at least first screening means by selecting a set of separation screens corresponding to a second set of composition values and having a correlation coefficient above a predetermined threshold and/or having a relatively low deviation value, preferably the lowest available deviation value, when compared to the first set of composition values; (g) installing the selected first set of separation screens in the first screening means; and (h) separating the infill into the plurality of fractions. (a) providing a dry or dried infill; (b) taking out a sample of the dry or dried infill; (c) pre-analysing the composition of the sampled dry or dried infill so as to obtain a first set of composition values corresponding to the composition of the infill, said pre-analysis comprising the steps of (i) separating the infill into a plurality of analysis fractions based on particle size and/or specific gravity by a pre-analysis unit, and (ii) determining the relative content of each separated analysis fraction in relation to the total content of analysed infill; (d) providing at least a first screening means configured to receive at least a first set of separation screens, the at least first set of separation screens being configured to separate the infill into the plurality of fractions; (e) comparing the first set of composition values of the dry or dried infill with a plurality of second sets of composition values of a database, each second set of composition values corresponding to a composition of materials and to a predetermined second set of separation screens, so as to obtain a correlation coefficient and/or deviation value between the first set of composition values and each of the plurality of second sets of composition values from the database; (f) selecting the at least first set of separation screens to be received by the at least first screening means by selecting a set of separation screens corresponding to a second set of composition values and having a correlation coefficient above a predetermined threshold and/or having a relatively low deviation value, preferably the lowest available deviation value, when compared to the first set of composition values; (g) installing the selected first set of separation screens in the first screening means; and (h) separating the infill into the plurality of fractions.