Filter elements are manufactured by OMEGA-AIR, and various media’s and micron ratings are available:

• Particulate (3 µm)
• Coalescing (1 µm, 0,01 µm)
• Activated carbon (0.001 µm)
  
  

All elements are pleated, except activated carbon, which is wrapped.

Alternative elements, to suit most Makes of compressed air inline filters are available:
Alternative filter elements for compressed air | Omega Air | Air and Gas Treatment