The Purewell Outdoor Water Filter Is A Portable Water Purifier Designed For ?Fresh Water Instantly?: Purewell Filter Straws are a camping gear and equipment for emergency situations. It's necessary when camping, hiking, mountain climbing, hunting, trekking, backpacking, biking, boating, car rides, outdoor trips and wilderness adventures. Your kit can never be too prepared. ?Easy To Use?: Get down close to the stream or lake and use it to drink straight from the source, or fill your water bottle and insert the filter to start sipping. ?Food Grade Material?: Build out of strong food-grade plastics, manufactured with BPA-Free, filtration accuracy is 0.01 microns which can provide you with a reliable source of clean drinking water at any time and anywhere. Especially in an emergency. ?Advanced Technology?: Outdoor Personal water filter can filter up to 99.9999% of the tiny material, sand, sediments. Built with 0.01-micron ultrafiltration membrane and can absolutely provide up to 1500 liters of drinking water. ?4-Stage Filtration??1.High-performance medical Grade Hollow Fiber UF Membrane, 2.Medical Grade PP Cotton, 3. Coconut Shell Activated Carbon, 4.Medical Grade PP Cotton. It's portable which makes it solution of water shortage in an emergency, and can instantly turn a water source nearby into drinking water.