What to Look For in a Filter

Filter Performance Criteria

In choosing any filter, the first question to answer is, "What must your filter provide?"

Removal Efficiency (Fluid Cleanliness)

Always look for filters that offer high efficiency removal and control of critical clearance size (and larger) particles.Controlling these particles increases component life and decreases maintenance and repair costs.


Be sure the filter you're considering performs predictably and efficiently throughout its service life.This reliability ensures maximum protection regardless of operating condition.

Filter Life

Your filtration solution should have high dirt-holding capacity and optimized construction for maximum service life.Long filter service life extends service intervals, resulting in lower filter and maintenance costs.


How to determine if a filter is designed for highly efficient removal

Compare Beta Ratios

The Beta ratio, ßx, is tan indicator of how well a filter controls particulate.It is the ratio of the number of particles (>xµm) entering the filter to the number (>xµm) that pass through.If one out of every two of the particles (>xµm) in the fluid pass through the filter, the filter's Beta ratio at xµm is "2."If only one out of every 200 of the particles (>xµm) pass through the filter, the Beta ratio at xµm is "200."Therefore, filters with a higher Beta ratio provide better particulate control and hence better system protection.


Supported vs.Unsupported Filter Elements

Cyclic flow, cyclic pressure and increasing pressure drops all affect the performance of a filter element.By incorporating the proper support structure, the filter element can be made to resist deterioration.By contrast, unsupported elements can experience compression and fatigue failures that greatly reduce reliability.