Does the filter’s micron rating indicate the maximum size of contaminant that it can remove

For many years now, some people have been misunderstanding the meaning of micron rating. They think micron rating indicates the maximum contaminant size that the filter will remove in one pass. What the micron rating actually indicates is the maximum contaminant size that the filter can remove in several passes. If you are targeting a particular micron rating, you should use two filters and place them one after the other.

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