What is Absolute Micron rating?

This is used to accurately define the grade or level of filtration delivered.  An absolute rating means 100% of particles larger than the filter rating (usually in microns) will be removed or entrapped on or within the filter medium i.e. 1 micron absolute will remove or entrap all particles greater than 1 micron as opposed to 1 micron nominal which may still let particles greater than 1 micron through.

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