Extend the capacity of your Frontier Pro with extra Series III GRN Line replacement filters. One extra filter literally doubles the amount of certified bacteria filtration on your journey, while adding less than a single ounce to your pack.

Certified filtration for 50 gallons (over 180 L)
Certified lead free (NSF/ANSI-372)
BPA free, chemical free, and iodine free
Filter made in the USA

Purchase from Aquamira

*Prices subject to change