Gravity water filter

Purpose

Produce group quantities of clean water at camp without effort.

Used in kits

• Backcountry Water Treatment Kit

  Camping

• Alaskan Float Trip Fishing Kit

  Fishing

Alternatives

• Squeeze filter— Lighter for one person; slow for a group.
• Purification tablets— No throughput limit but slow and worse-tasting.

Maintenance notes

• Backflush when flow slows.
• Never let the element freeze while wet — it silently ruins the filter.

Buying considerations

• Rated flow rate matters most for larger groups.
• A pre-filter extends element life in silty water.