The LifeStraw Activated Carbon Filter is compatible with all LifeStraw Go 2-Stage Water Bottles, LifeStraw Go Steel, LifeStraw Steel and LifeStraw Universal. It improves taste and protects against bacteria, parasites, microplastics, chlorine, organic chemical matter, dirt, sand, and cloudiness. Your purchase impacts one child having safe water for one year. Shop at Sawyer's Country Edge.