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What is a Micron Rating for a Water Filter?

20May, 2015

Water filter micron rating


Relationship of Particle Sizes by Diameter

1 Micron = 1 Thousandth of a Millimeter
40 Microns = Visible with Magnification
40 to 90 Microns = Diameter of a Human Hair


A micron rating for a fluid filter is a generalised way of indicating the ability of the filter to remove contaminants by the size of the particles.

For example, a filter with a micron rating of 7 will filter out contaminants of 7 microns or larger and a filter with a micron rating of 3 will filter out contaminants of 3 microns or larger. Filter efficiency refers to a measurement of the filter’s retention efficiency.

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