Ultrafiltration Explained: How Pore Size Determines What Gets Removed
Ultrafiltration
How pore size determines what gets removed
How ultrafiltration works
A UF system pushes water through bundles of hollow-fiber membranes with pores typically in the 0.01 to 0.1 micron range. Anything larger than the pore size gets physically blocked, while water molecules and dissolved minerals pass through - no pump, no electricity, minimal water waste.
| Membrane type | Pore size | Removes |
|---|---|---|
| Microfiltration | 0.1-10 micron | Larger solids, most bacteria (not viruses) |
| Ultrafiltration | 0.01-0.1 micron | Bacteria, cysts, colloids, many viruses |
| Nanofiltration | 0.001-0.01 micron | Most organics, some dissolved salts |
| Reverse osmosis | 0.0001 micron | Nearly all dissolved solids |
Key takeaway
Pore size determines physical particle removal, not chemical removal. UF cannot remove PFAS, fluoride, arsenic, or dissolved salts.
Who UF makes the most sense for
Households whose primary concern is microbiological safety - well water with bacterial risk, or anyone wanting improved water quality without RO's water waste, storage tank footprint, or membrane cost. Often paired with carbon for taste and odor.
Frequently asked questions
- Does UF remove PFAS?
- No - PFAS molecules are far smaller than UF's pore size and pass through.
- Does UF waste water like RO?
- No - it's a purely mechanical process with minimal wastewater.
Recommended solutions
Explore AquaVerde systems built for different homes and water sources
UF5
5-stage ultrafiltration - bacteria and sediment reduction while keeping natural minerals.
Learn more →Pure Water. Pure Life.
