The fluid technology product range, which includes a very extensive range of hydraulic filters, is the division of MAHLE Industrial Filters with the greatest proportion of turnover. More than ever before effective filtration is the key to the operation of highly-sensitive hydraulic systems. The lower and lower tolerances of the various hydraulic equipment demand strict observance of the specified degree of purity of the fluid medium. The filter manufacturer is therefore obliged to im prove the efficiency of hydraulic filters continually, and to improve their efficiency by developing new filter materials..