Answer: Adsorption (activated carbon) filters that use surface attraction have problems such as limited service life and reduced adsorption capacity after the adsorbent absorbs oil.
The main material of absorption filters, such as wool, felt and cotton, will lose its structural advantage and quickly fail after absorbing liquid and soaking it.
Mechanical separators and mesh air filters are usually classified as 5, 10, 20μm and 40μm, and are ineffective for most of the tiny particles in oil droplets.
