To EPA and NSF/ANSI standards.
The Tactical Frontier Pro ultralight water filter keeps you safe from waterborne illness when it matters most. Connect it to a platypus bag or soda bottle, use it terminal-end with your favorite hydration reservoir, use as a straw filter, and so much more.
You would never know with a quick glance but the Frontier Pro has been completely redesigned from the ground up starting with an entirely new, replaceable GRN Line filter that provides reliable bacterial removal at higher flow rates than the previous cyst removal version. Now you can change out filters as needed and carry spares at under an ounce each.