Originally Posted by O C Diver
So, even though your element is rated at 30 microns, the filter pics up the majority of contaminants between 2 and 30 microns. Parker (Racor) has an excellent PDF on this explaining how it works. Ted
Precisely Ted. Filtering 101 at work.
Parker, Cat and others have done studies where the P80 can become less than 20% or the original rated filter size before rated capacity/flowrate is affected. Unless an over sized filter body, the filter blinds off or is severely restricted by this point - one of the advantages of very big filters for a given flow rate.