Today I installed a new Harmsco Industrial Filter element in the 20 micron filter housing of my Spectra Catalina
Maker. When I checked the size of the pores in the filter, one end cap said 50 microns and the other end said 20 microns. Both end caps on the element were blue, just like all the other 20 micron filters I have used before and have in stock. Going with a preponderance of evidence, I concluded that the filter was in fact 20 microns but somehow was manufactured with one incorrectly printed blue end cap. These filter elements were supplied by the installer in early 2005.
Is my conclusion sound? What are the repercussions if wrong? Have you ever heard of a filter element mismarked this way?