The life straw is a portable and ultra-light water filter. It has passed the SGS, TUV and other tests or certifications. The use of carbon fiber membrane filter which is imported from overseas market can ensure the filter hole reaches up to 0.05 micrometers. This filter can effectively remove pathogenic bacteria and heavy metal ions from water. You can drink water within 3-5 seconds only by sticking the straw into water with depth of 4-8 centimeters and then gently suck the water.