Question: what is the difference between 1 micron and 5 micron?
Answer: Consequently, the 20-micron filter element will let larger particles pass through the filter than the 5-micron media would. Bacteria range in size from 0.2 to 2 microns in width or diameter and from 1 to 10 microns in length for the nonspherical specie, so a 1-micron filter will remove most bacteria and cysts.