Micron Rating in Water Filters

A micron is a unit of length equal to one millionth of a meter — also called a micrometer, mu. 


A human hair is approximately 70 microns, give or take 20 microns depending on the thickness of a given individual's hair. 

The typical filtration size of a coffee filter is approximately 20 microns, however, they are not made to an exacting standard and, thus, are likely to vary in the actual pore size.

Typical water filtration systems will use varying micron ratings depending on the specific water and use conditions.  The lower the micron rating the smaller the particles that it will remove from the water.  A typical POE (point of entry) water filter might be from 20 to 50 microns.  Carbon filter drinking water systems are usually less than 5 micron.  RO Reverse Osmosis filters all the way down to 0.0006 microns.  Wow! 


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