High-purity, finely fibrillated cellulose fibers form the support structure of Cellulose 's depth filter sheets and provide a large internal surface. Different perlite qualities ensure a voluminous, asymmetric pore structure and thus a large dirt holding capacity. Conventional depth filter sheets with different clarifying sharpness and unfiltrate volume offer specifically tailored filtrate quality in all filtration ranges. Due to its structure, diatomite has very good filter characteristics. The quantity and type of the diatomite processed determines the clarifying sharpness and the throughput rate