Package Contains 1 additional activated carbon filter for use with any 3/4" or 1" Exhalation Filter.
Specifically for Masking Fashion Masks.
Re-Usable & Replaceable:Flexzorb: HEPA-type activated charcoal filter keeps out odors and sub-micron particles (down to 0.3 microns).
It has also been tested by the UK's HealthProtection Agency and proven to be virucidal (when tested against surrogate virus MS2-Coliphage). FLEXZORB® truly is the most advanced and absorptive activated carbon cloth known to science.
Effective period: Filter is effective for about one month or 69 hours of use, whichever is sooner. After please wash following instructions.