Water Purification for Hikers: Filters, UV, Chemical, and Boiling Compared¶

Mountain water can harbor Giardia, Cryptosporidium, and bacteria even in the clearest streams. This guide compares the four major purification methods — mechanical filters, UV purification, chemical treatment, and boiling — covering effectiveness against different pathogens, speed, weight, cost, and which method works best for different mountain environments.

Introduction¶

Why All Mountain Water Needs Treatment¶

What's in the Water¶

Bacteria¶

Protozoa — Giardia and Cryptosporidium¶

Viruses¶

Chemical and Heavy Metal Contaminants¶

Mechanical Filters¶

Pump Filters¶

Gravity Filters¶

Squeeze Filters¶

Hollow Fiber vs. Ceramic¶

UV Purification¶

SteriPEN and Alternatives¶

Effectiveness and Limitations¶

Chemical Treatment¶

Iodine¶

Chlorine Dioxide¶

Speed and Taste¶

Boiling¶

Time at Different Altitudes¶

Fuel Cost Consideration¶

Choosing by Environment¶

Clear Mountain Streams¶

Glacial Meltwater¶

Developing Countries¶

Method Comparison Table¶

Budget Recommendations¶