UV water filters use ultraviolet light to kill bacteria, viruses, and parasites in drinking water. No chemicals, no taste change.
How They Work
Water passes through a chamber with a UV-C light bulb. The UV light damages the DNA of microorganisms, rendering them harmless. Most UV filters kill 99.9% of pathogens.
Best UV Filters
| Model | Flow Rate | Power | Price |
|---|---|---|---|
| SteriPEN Adventurer | 500ml/min | USB/batteries | £70 |
| MSR Guardian | 1000ml/min | Battery | £150 |
| Viqua D4 | 12v plumbed-in | 12v | £200 |
| Pureblue | 12v plumbed-in | 12v | £180 |
Plumbed-In vs Portable
- Plumbed-in (Viqua, Pureblue): Fitted to the van's water system. Treats ALL water from the tap. Need 12v power. Costlier but hands-free.
- Portable (SteriPEN): Dip the wand into a bottle or jug. 90 seconds per litre. Battery powered. Cheaper and simpler.
Pre-Filter Requirement
UV filters need a pre-filter (5-micron or finer) to remove sediment. Without one, suspended particles shield microorganisms from the UV light. Add a £15 inline sediment filter before the UV unit.
UK Water Reality
UK tap water is already treated. UV filters are useful for:
- Wild camping where you fill from rivers or streams
- European travel where water quality varies
- Extra peace of mind if you fill from unknown taps
Verdict
A portable SteriPEN is useful for wild camping. A plumbed-in UV system is overkill for UK-only van life.
