LifeStraw Go 2 Stage Replacement Membrane Microfilter - Compatible with Go series water bottles purchased 2023 or later. Not compatible with earlier models that feature the flip-up mouthpiece and carabiner attachment. Protects against bacteria (including E.coli, Salmonella), parasites (including Giardia and Cryptosporidium), microplastics, chlorine, organic chemical matter, silt, sand, and cloudiness; improves taste Features Long-lasting membrane microfilter lasts up to 1,000 gallons (4,000 L) and will stop allowing water to flow through once it’s reached the end of its lifetime Activated carbon filter lasts up to 26 gallons (100 L) of water with proper use and maintenance. LifeStraw is proud to be a B Corp and Climate Neutral Certified brand For every purchase, a child in need receives to safe drinking water for a year.