In applications relying on the quality of air produced by the compressor & dryer, ensuring air filters aren’t clogged will vastly contribute to a better quality of air produced. Operation costs whilst using clogged filters may also begin to exceed the replacement costs so refer to your manufacturer’s recommended replacement schedule.
Certain coalescing filters may not ever develop excessive pressure differential on a pressure gauge, yet the performance will degrade over time consequently allowing the possibility of lubricant contaminated air downstream, contaminating the equipment.