Water Filter
Overview
A water filter is a device that removes bacteria, protozoa, and particulate matter from natural water sources. It improves drinking safety during backcountry travel.
Key points
- Removes common pathogens such as Giardia and Cryptosporidium.
- May use pump, squeeze, gravity, or straw-style mechanisms.
- Does not remove viruses unless specially designed.
- Performance affected by sediment load and freezing conditions.
- Requires maintenance such as backflushing or cartridge care.
Details
Filters rely on physical barriers to trap microorganisms. They vary in pore size, durability, and flow rate. Sediment-heavy sources can clog filters quickly, reducing flow and requiring maintenance.
Hikers pair filters with other treatment methods when traveling in regions where viruses may be present. Freezing conditions can damage filter membranes, rendering them ineffective.
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Illustrative hiking footage
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