1. AUTHORITATIVE CERTIFICATION: Filter Straw, SGS, TÜV certified, test report ASH15-005515-01, Portable Personal Filter Straw, is a survival gear and emergency equipment. It is essential for camping, hiking, climbing, hunting, trekking, backpacking, biking, boating, RVing, foreign travel and wilderness adventure! 2. 5 STAGE FILTER: The outdoor personal water purifier's 5-stage filtration system, including hollow fiber ultrafiltration membrane, coconut shell activated carbon, mesh plugs, and double-layer medical-grade PP cotton fibers, filters out up to 99.9999% of environmentally unfriendly water, odors, residual chlorine, organic matter, and other microscopic substances (Note: TDS value cannot be reduced to ensure that the essential mineral balance of the water is not affected). 3. FILTRATION ACCURACY: The Survival Gear Water Purifier removes substances from water with a pore size of 0.01 microns and still maintains an optimal flow rate (550 ml/min) compared to other products with a 0.1 micron filtration accuracy, while maintaining the filtration accuracy of this mountaineering gear. 4. LONG LIFE: This wilderness survival essential water filter delivers 1,500 liters (396 gallons) of clean, safe drinking water. 8.7-inch hose lets you drink without having to lay on the ground. Fits any 28mm threaded bottle. Weighs less than 3.5 ounces. Fits in your hand, pocket, gym bag, survival kit.