UV Water Purification: How It Works and Why It's Never Used Alone
UV Systems
How it works, and why it's never used alone
Disinfects, doesn't filter
UV systems use ultraviolet-C light, typically around 254 nanometers, delivered through a lamp in a sealed chamber. As microorganisms pass through, the light damages their DNA and RNA - disrupting their ability to reproduce, not removing them chemically or physically.
Key takeaway
UV disinfects - it does not filter. It has zero effect on sediment, chemicals, heavy metals, or PFAS. It's always paired with pre-filtration, never used alone.
Where UV makes the biggest difference
| Situation | Why UV helps |
|---|---|
| Private well water | Bacterial contamination risk with no municipal disinfection |
| Boil-water advisories | Confirmed or suspected bacterial contamination events |
| Chemical-free preference | No chlorine taste, no disinfection byproducts |
What a UV system needs to work
Adequate pre-filtration (cloudy water blocks UV light from reaching organisms), consistent power, correct flow rate, and annual lamp replacement - output degrades gradually even while the lamp still appears on.
Frequently asked questions
- Does UV treatment remove chlorine or lead?
- No - UV is disinfection only, with zero effect on chemical or dissolved contaminants.
- Do I need UV on municipal water?
- Less commonly necessary, since city water is already disinfected. Most valuable for wells.
Recommended solutions
Explore AquaVerde systems built for different homes and water sources
UV30 whole house
Whole house UV water treatment for chemical-free microbial disinfection.
Learn more →Pure Water. Pure Life.
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