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It has been recognised for many years that the majority of failures in fluid power transmission components can be directly attributed to contamination. Furthermore, it has been observed that the size and concentration of these contaminant particles effects the wear rate of components. As a consequence of the reduction in acceptable dimensional tolerances of electro/hydraulic actuators, the acceptable cleanliness levels of fluid power oils have also reduced. Full-flow barrier media filtration alone can no longer cope with the necessary cleanliness levels for the smooth and consistent operation of electro/hydraulic actuators over their desired service life. By-pass filtration is the key to controlling oil cleanliness between services. Unfortunately, traditional barrier media filters of a suitably low micron rating tend to be excessively large to meet the desired service interval.