High-performance filtration: The main combination of hollow fiber ultrafiltration (UF) membrane and antibacterial carbon fibers can remove 99.99% of impurities, as well as sediments, odors, color, chlorine, organic matter, and heavy metals. With SGS and CE certification to ensure clean and safe drinking water. Long-lasting and washable: The Vortopt gravity filter is designed for long-term use. With a filtering capacity of over 4000 liters of water, this filter ensures a reliable supply of clean and safe drinking water during your outdoor adventures. Thanks to its washable function, you can easily extend its lifespan and ensure reliable performance over time. High-quality material: Our water filtration system is made of BPA-free ABS and food-grade plastics, making it safe and durable. The versatile filtration modes allow you to use it as a set or separately, making it a great addition to your outdoor gear. Lightness and portability: This portable water purifying straw is designed to fit different water bottles and water bags, making it compatible with different outdoor gear setups. Whether you are hiking, traveling, or camping, its lightweight and compact design allows for easy transportation. Multiple use scenarios: The Vortopt gravity filter is designed for versatility, making it ideal for outdoor enthusiasts engaging in a variety of activities. All our filter systems are designed to filter only fresh water sources or municipal tap water. Some examples of fresh water sources include: lakes, rivers, streams, and snow water.