Water Filtration for Backpacking: Pump vs Squeeze vs UV vs Chemical

What's in Backcountry Water

Three threats: protozoa (Giardia, Crypto — 1-15μm), bacteria (E. coli — 0.2-5μm), viruses (Noro, Hep A — 0.02-0.1μm). In North America, viruses are rare — protozoa and bacteria are the concern.

Squeeze Filters: Best All-Around

Sawyer Squeeze

$35 Track water filter deals

0.1μm absolute, 3 oz, rated 100,000 gallons. Most popular backpacking filter — backflushable, nearly indestructible.

Katadyn BeFree 1.0L

$45 Track water filter deals

0.1μm, 2 oz, 2L/min flow when new. Fastest squeeze filter — great for trail running.

UV Purifiers

SteriPEN Ultra

$90 Track water filter deals

UV-C purification (kills viruses too), 5 oz, rechargeable, 90-sec per liter. Best for international travel.

Chemical: Ultralight Backup

Aquamira Water Treatment Drops

$15 Track water filter deals

Chlorine dioxide, 1 oz for 30 gallons. 15-30 min treatment time.

Katadyn Micropur MP1 Tablets

$14/30 Track water filter deals

Chlorine dioxide tablets. 15-min bacteria, 4-hour Crypto.

Sources & Further Reading

1. CDC water treatment guidance — public-health guidance on making water safer when traveling or recreating outdoors.
2. CDC Yellow Book: water disinfection — method-by-method context for boiling, filtering, chemical treatment, and UV.
3. Wilderness Medical Society water treatment guideline record — CDC-hosted record for wilderness and travel water treatment guidance.