A rotary disc filter device comprises a rotary drum and a plurality of disc-shaped filter members secured about the drum. A location pointer is maintained in a dynamic list of entries for cache page cleaning. The protein crystal growth conditions of each of the micro-chambers is adjusted so that the protein crystal growth conditions of each of the micro-chambers differs. The modular unit provides a three loop cooling system for easy connection to both a combustion gas turbine air inlet and to a cooling water tower. The light exit opening has associated therewith a grille structure or a labyrinth structure acting as a microwave shield. By combining the output of two interpolation methods and by calculating a mix factor using only the output of one interpolation method, the interpolation results may be improved.