A passive low-pass filter removes the unwanted high-frequency components, i.e., smoothes the pulses out and recovers the desired low-frequency signal.

This filter removes liquid water, oil and particulate from the compressed air.

The clay filter removes any oil-soluble substances, organometallic compounds (especially copper) and particulate matter, which might prevent meeting jet fuel product specifications.

Downstream, a bioreactive biological filter removes and retains additional particulate matter down to a particle size of 100 micrometres.

The filter removes almost every trace of arsenic from well water.