A toilet bowl screen is provided for use in connection with a typical toilet bowl. Aromatic or heteroaromatics of this type play an important role in industry as reagents or intermediates for pharmaceuticals and agrochemicals and in diverse fine and electronics chemicals, above all in the rapidly growing field of organic semi-conductors, in particular in organic or polymeric light diodes, organic solar cells and organic ICs. The system consists of two hierarchical levels of processing. Each supporting member is shaped so as to make all the principal planes of the supporting member parallel to the second direction. The second rod has a second upper end and a second lower end such that the first lower end and the second lower end are connected with the substrate.