This replacement filter is designed for Life Straw Go 2-Stage Water Bottles featuring a flip-top mouthpiece and carabiner, as well as Life Straw Universal models. It is not compatible with the newer Life Straw Go Series bottles with tote-style handles. The filter effectively removes bacteria like E.coli and Salmonella, parasites such as Giardia and Cryptosporidium, microplastics, chlorine, organic chemicals, and sediment, while enhancing water taste. Tested independently, the durable membrane filter treats up to 4,000 litres, and the activated carbon lasts for 100 litres with proper care. Using this filter helps eliminate reliance on single-use plastic bottles. Features:• Compatible with Life Straw Go 2-Stage Water Bottles with (flip top mouthpiece and carabiner) and Life Straw Universal. NOT compatible with the new Life Straw Go Series water bottles (tote style handle)• Protects against bacteria (including E.coli, Salmonella), parasites (including Giardia and Cryptosporidium), microplastics, chlorine, organic chemical matter, silt, sand, and cloudiness; improves taste• Independently lab tested long-lasting membrane microfilter lasts up to 4,000 L and activated carbon filter lasts up to 100 L of water with proper use and maintenance.• Compatible with all Life Straw Go 2-Stage Water Bottles and Life Straw Universal.• Every fill of your Life Straw Go or Life Straw Universal compatible bottle avoids the need for single use plastic bottles of water!