Lifestraw Activated Carbon Filter 2pack Compatible with all LifeStraw Go and Go Series Water Bottles Each carbon filter lasts up to 26 gallons (100 L) – about two months. Protects against chlorine, organic chemical matter, and sand, dirt, cloudiness for improved taste Independently lab tested Every fill of your LifeStraw Go, LifeStraw Steel, or LifeStraw Universal compatible bottle avoids the need for single use plastic bottles of water! Your purchase has impact: one purchase, one child, one year of safe water