Features: Lifespan: Can treat minimum 2000L(530Gallons) water from any freshwater lake, river, or stream. Advanced water purification: 4-Stage Filtration includes pre-filter, activated carbon filter,0.1 micron hollow fiber UF membrane and high polyiodine resin filter media Filter material: filling high polyiodine resin + granular coconut shell activated carbon + carbon fiber + hydrophilic hollow fiber microporous membrane Precise filtration: Precise filtration system removes sediment, dust and other particles in the water. Special multi-functional advanced activated carbon fiber and high polyiodine resincan effectively reduce water turbidity and remove bad taste Package include: 1 x Water filter straw Specification: Material: Plastic shell Size:20x3.3cm Weight: 60g Color: Army green, navy blue, sky blue Package List: 1 x Water Filter Straw