Sawyer water filters: seven common questions
What a Sawyer filter removes, what it cannot treat, how to maintain it and when you need another source of drinking water.
A compact filter can be useful on a trip, but it needs to suit the water you intend to treat. These seven answers concern the standard Sawyer MINI and Squeeze filters. Other Sawyer systems may have different capabilities.
1. How does the filter work?
The standard MINI and Squeeze use a hollow-fibre membrane with an absolute pore size of 0.1 microns. They are designed to remove bacteria and protozoa. Clear water flowing from a filter does not prove that every contaminant has been removed.
2. What does it leave behind?
These standard filters do not remove viruses, salt or dissolved chemical contamination. Avoid water near discharges, flooding or suspected pollution. A filter does not automatically make an unknown water source safe.
3. How long does it last?
Maintenance, damage and storage matter more than a large lifetime-volume claim. Check your own model and its instructions before leaving. Include a backup plan for reliable drinking water on your trip.
4. When should you backwash it?
Follow Sawyer's instructions for backwashing, cleaning and storage. Reduced flow calls for maintenance. Keep the clean outlet, caps and collecting bottle away from untreated water. Do not use a cleaning method or connection that is not intended for your model.
5. What about freezing or damage?
Sawyer recommends replacing a previously wet filter if it may have frozen. Looking through it cannot reliably rule out this damage. Check for damage after drops too, and never rely on a questionable filter as your only drinking-water option.
6. MINI or Squeeze?
Compare the things your trip requires: packed size, ease of handling, flow, bottle compatibility and maintenance equipment. Check the current product specifications. One model is not the best choice for every person.
7. Does it belong in an emergency kit?
A filter can complement a suitable water supply. Store reliable drinking water first and think about when you would actually use the filter. It cannot replace stored water when no suitable source is available.
Read Sawyer's maintenance guidance and limitations. Then compare outdoor water filters or read our guide to getting prepared at home.