Restore flow rates in your HyperFlow Microfilter with fresh, new Hollow Fiber media.

Replacement cartridge only for MSR HyperFlow filters. Hollow fiber filter lasts up to 1,000 liters and meets NSF Protocol P231 for the removal of 99.9999% of bacteria and 99.9% of protozoa from beginning to the end of filter life in 'worst-case' water. Made in the USA