High efficient water purification: The outdoor water filter straw can filter up to 10,000 liters of water, and the maximum flow rate is 550 ml/min. You only need to put the filter straw into the water source (stream, lake or bottle filled with water) and you can drink drinking water easily and quickly. Efficient water purification: The straw water purifier uses a four-stage filtration system (medical coconut shell, PP cotton, hollow fiber, ultrafiltration membrane, activated carbon, medical PP cotton) to achieve a filtration efficiency of 0.01 microns, with 99.9999% of impurities and solid sediments, etc. can be effectively removed. Safe material: Survivable personal water filter is made of food-grade ABS plastic, BPA-free, which can ensure drinking water safety and reduce pollution. Portability: The survival water filter weighs only 80g and measures 1.26 x 1.26 x 8.74 inches. The strap and compact, lightweight design are ideal for portability. The extra 20cm hose is suitable for sucking water from kettles/kettles. Wide applicability: The emergency water purifier is an essential tool for hiking, hunting, camping, mountaineering, trekking, cycling, boating, horseback riding, backpacking, domestic and international travel, field research or emergencies. You can take it outdoors and drink safe drinking water with ease. Cleaning method: Rinse with clean water after use and blow air into the suction tube regularly to keep the filter clean and prevent clogging. If the filter is clogged, immerse the filter suction tube in clean water for a few minutes, and then rinse the suction tube with clean water to remove debris.