Continue to get potable water from your LifeStraw Go bottle by replacing the filter with LifeStraws Go Two-Stage Replacement Filter. Innovative two-stage filtration ensures water is safe to drink. The first stage uses an advanced hollow-fiber membrane to remove up to 99.9999% of waterborne bacteria as well as up to 99.9% of waterborne protozoan parasites for up to 264 gal. The second stage then uses a replaceable activated-carbon capsule to reduce chlorine, bad odor, bad taste and organic chemical matter (like pesticides) for up to 26 gal. or three months (whichever comes first). Easy to replace. Meets the EPAs drinking-water standards. Compatible with all LifeStraw Go bottles. Per each. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Replacement Filters.