What Is Micron Filter?
A micron filter is a water or air filter rated by the smallest particle size it can remove, expressed in microns (one millionth of a meter).
Classification: Ecology & Environment › Micron Filter
Key Takeaway
Micron ratings matter for water safety. A 5-micron or finer filter removes most parasite cysts; 1-micron or finer improves coverage.
Why This Matters
Micron ratings describe the smallest particle size a filter is designed to capture. For water, a 5-micron filter removes most protozoan cysts like Giardia and Cryptosporidium, while a 1-micron absolute filter captures virtually all cysts and many bacteria. Reverse osmosis takes filtration further, removing dissolved contaminants. The “nominal” vs “absolute” distinction matters: a nominal rating is average performance, while absolute means every particle above that size is captured.
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Frequently Asked Questions
What does a 5-micron filter remove?
Most protozoan parasite cysts like Giardia and Cryptosporidium, along with sediment, rust, and many larger particles.
Is 1 micron better than 5 micron?
It removes smaller particles, including more bacteria and all parasite cysts with an absolute rating. It also slows water flow and clogs faster.
Does a micron filter remove viruses?
No. Viruses are typically 0.004 to 0.1 micron. Removing viruses requires additional steps like UV, ozone, or reverse osmosis.
