That's gravity, but there are two different Sawyer 4l gravity systems. Model number is on the box. They differ in speed, weight, and ability to filter viruses.
Edit: Another major player...
Type: Posts; User: DemostiX
That's gravity, but there are two different Sawyer 4l gravity systems. Model number is on the box. They differ in speed, weight, and ability to filter viruses.
Edit: Another major player...