The Camelbak Lifestraw Crux 2L Reservoir Filtration Kit filtered by LifeStraw® passes 2 liters of water through two complete stages of filtration - the Hollow Fiber Filter removes of bacteria, parasites, and microplastics and the Activated Carbon Filter reduces taste, odor, and chlorine. Easy to fill and equipped with multiple features to ensure reliably safe and leak-proof personal hydration. Every purchase shares the gift of clean drinking water - one product, one child, one year of safe water.STAGE 1HOLLOW FIBER MEMBRANERemoves 99.999999% of bacteria (E. coli, etc.)Removes 99.999% of protozoa (Giardia Cryptosporidium, etc.)Removes 99.999% of microplasticsFilters 4,000 liters (1,000 gallons)STAGE 2ION EXCHANGE FILTERReduces chlorine and leadRemoves bad odor and tasteRemoves organic chemical matter (Pesticides, Herbicides)Filters 100 liters (25 gallons)