| Targets | Bacteria, protozoa AND viruses |
| Methods | UV, chemical, boiling, fine purifiers |
| Vs filter | Adds virus protection |
| Difficulty | Beginner |
Water purification is treating backcountry water to remove or kill all pathogens — including the viruses that filters miss — using methods like UV light, chemical drops or tablets, or boiling. ‘Purifier’ implies virus protection, unlike a basic filter. The right method depends on the water source, region, and how clear the water is.
Methods
Boiling, UV purifiers, and chemical treatment all kill viruses a filter can’t.
Filter vs purifier
See water filter vs purifier; both are forms of water treatment.
Frequently asked questions
What's the difference between a filter and a purifier?
A filter physically strains out bacteria, protozoa, and sediment but usually not viruses; a purifier eliminates viruses too, via finer media, chemical disinfection, or UV light. Use a purifier (or add chemicals/UV) where viral contamination is a real risk.
How do you purify water?
Common methods are boiling (the most foolproof — bring to a rolling boil), UV light pens (which neutralize pathogens in clear water), and chemical treatments like chlorine dioxide or iodine drops/tablets. Some purifier devices combine fine filtration with these to remove viruses as well.
Do you need to worry about viruses in backcountry water?
In remote North American wilderness, viruses are generally a low concern and a filter usually suffices. But in areas with human or livestock contamination, or when traveling internationally, waterborne viruses are a real risk, so purification (UV, chemical, or boiling) is recommended.
Sources
- Water disinfection — CDC
- Water treatment — American Hiking Society