Replace old microfilters to get safe drinking water on the go again with the Lifestraw Go Series Replacement Membrane Microfilter. This Lifestraw filter works with Go Series water bottles purchased in 2023 or later. (It is NOT compatible with earlier models that feature the flip-up mouthpiece and carabiner attachment.) Once installed, it protects against bacteria (including E.coli, Salmonella), parasites (including Giardia and Cryptosporidium), microplastics, chlorine, organic chemical matter, silt, sand, and cloudiness. Plus, it helps improve taste. It lasts up to 1,000 gal. (4,000L) and will stop allowing water to flow through once it has reached the end of its lifetime. The activated-carbon filter lasts up to 26 gal. (100L) with proper use and maintenance.Manufacturer model #: LGV4WH2TWW. Compatible with Go Series water bottles purchased in 2023 or later (not included) Protects against bacteria, parasites, microplastics, chlorine, organic chemical matter, silt, sand, and cloudiness Helps improve taste Lasts up to 1,000 gal. (4,000L) and stops allowing water through once it's used up Activated-carbon filter lasts up to 26 gal. (100L)