Watershed Gravity Filter System — 4L

After a long day breaking camp and logging miles on a remote trail, arriving at basecamp with a thirsty crew means you need a serious water solution. The Cairn Backcountry Watershed Gravity Filter System is built for just these moments, effortlessly providing clean drinking water for your entire group.

This 4-liter system leverages gravity to deliver a robust 1.75 liters per minute, so you can focus on setting up camp instead of pumping water. Its advanced 0.2-micron hollow-fiber filter reliably removes bacteria and protozoa, purifying up to 1,500 liters and meeting stringent EPA standards for drinking water. Crafted with durable 210D nylon laminated TPU reservoirs and intuitive quick-connect fittings, it's designed for simple setup and hassle-free operation, whether you're group backpacking, car camping, or overlanding.

Technical

Weight	340 g
Throughput L/min	1.75
Pore Size Um	0.2
Cartridge Life L	1,500
Meets Epa	true
Filter Type	hollow-fiber gravity