Reference matrix
Water Purification Method Comparison
Every field-worthy backcountry water treatment compared head-to-head on virus / bacteria / protozoa efficacy, weight, throughput, cold-weather reliability, and cost per liter. Sources cited at bottom.
| Method | Viruses | Bacteria | Protozoa | Chemicals | Weight | Throughput | Cold-weather | Cost / L |
|---|---|---|---|---|---|---|---|---|
Hollow-fiber squeeze filter Sawyer Squeeze, Katadyn BeFree, Platypus QuickDraw | No | Yes | Yes | No | 60–90 g | 1–2 L/min | Poor (freezes) | $0.001 (100k L rated) |
Pump filter MSR MiniWorks, Katadyn Hiker Pro | No | Yes | Yes | Partial (carbon element) | 400–500 g | 1 L/min | Good | $0.02 |
Gravity filter Platypus GravityWorks, MSR AutoFlow XL | No | Yes | Yes | No | 300–370 g | 1.75 L/min | Poor | $0.005 |
UV purifier SteriPEN Ultra, Katadyn Steripen | Yes | Yes | Yes | No | 140 g | 1 L / 90 sec | Good (batteries suffer) | $0.03 (batteries) |
Chemical (chlorine dioxide) Aquamira, Katadyn Micropur MP1 | Yes | Yes | Yes | No | 60 g (dropper) | 30 min (4 hr for Crypto) | Excellent | $0.10 |
Chemical (iodine) Potable Aqua, Polar Pure | Yes | Yes | Partial (Crypto resistant) | No | 40 g | 30 min | Excellent | $0.05 |
Boiling Any pot + stove | Yes | Yes | Yes | No | n/a (uses stove) | 5–10 min bring to rolling boil | Excellent | $0.05 (fuel) |
Reverse osmosis pump Katadyn Survivor 06 | Yes | Yes | Yes | Yes | 1130 g | 1 L / 20 min | Good | $1.50 |
Hollow-fiber squeeze filter
Sawyer Squeeze, Katadyn BeFree, Platypus QuickDraw
Lightest defensible option in North American / European backcountry. Fibers rupture if frozen — never leave in a cold vestibule.
Pump filter
MSR MiniWorks, Katadyn Hiker Pro
Ceramic elements can be back-flushed indefinitely. Heaviest option — best for basecamp use with silty water.
Gravity filter
Platypus GravityWorks, MSR AutoFlow XL
Group-trip favorite. Hang and walk away — no pumping. Same freeze vulnerability as squeeze filters.
UV purifier
SteriPEN Ultra, Katadyn Steripen
Only true portable option that inactivates viruses without chemicals. Needs clear water — pre-filter turbid sources through a bandana.
Chemical (chlorine dioxide)
Aquamira, Katadyn Micropur MP1
Kills viruses and even Cryptosporidium at long contact times. Freeze-proof, TSA-friendly, doesn't clog. Slight taste.
Chemical (iodine)
Potable Aqua, Polar Pure
Cheap and effective for viruses/bacteria. Not recommended for pregnancy, thyroid conditions, or long-term use.
Boiling
Any pot + stove
CDC guidance: 1 minute at rolling boil (3 minutes above 6,500 ft / 2,000 m) kills all pathogens. Fuel-heavy — use only when other options aren't available.
Reverse osmosis pump
Katadyn Survivor 06
Only option that removes salt from seawater. Extreme cost and effort — carried on ocean-going kayaks and life rafts only.
Sources
- EPA Guide Standard and Protocol for Testing Microbiological Water Purifiers (1987, still in force).
- CDC: A Guide to Drinking Water Treatment and Sanitation for Backcountry & Travel Use.
- WHO Guidelines for Drinking-Water Quality, 4th edition.
- Manufacturer NSF/ANSI test reports for Sawyer, Katadyn, MSR, Platypus, SteriPEN.
Last reviewed: 2026-07-25.
Frequently asked questions
Which water treatment is best for backpacking in North America?+
For most North American backcountry water sources (streams, lakes, springs above 2,000m without livestock), a hollow-fiber squeeze filter like the Sawyer Squeeze is the standard: 3-log Cryptosporidium removal, sub-100g, negligible cost per liter. Add chlorine dioxide tablets as a freeze-safe backup.
Do I need to worry about viruses?+
Viruses (Norovirus, Hepatitis A, Rotavirus) are the primary concern for international travel and any water source downstream of human habitation. In remote North American wilderness, virus risk is low but non-zero. UV purifiers and chemical treatments handle viruses; filters do not.
What's the actual difference between a 'filter' and a 'purifier'?+
Regulatory definition (EPA): a purifier must inactivate viruses (>4 log reduction), bacteria (>6 log), and protozoa (>3 log). A filter is only required to handle bacteria and protozoa. Every UV device, chemical treatment, and RO pump on this page qualifies as a purifier; hollow-fiber and pump filters do not.
Can I embed or cite this comparison?+
Yes — please link to https://wild10.com/tools/water-purification-matrix. Every efficacy claim on the page traces back to a published EPA, CDC, WHO, or manufacturer specification.