✓Versatile Filtering Modes - The squeeze filter system can not only be used as a set, but also can be used separately. Water filter straw can be used as a replacement for gravity filter to obtain clean water. Collapsible water bottle can store water during your trips. ✓Smaller Pore Size - We all know that the smaller pore size, the higher the filtering accuracy, Our pore size is 0.1 microns which can reduce 99.99999% of E. Coli. Compared to the 0.2-micron filter straw on the market, Membrane Solutions 0.1 microns pore size filter straw maintains the optimum flow rate (500ml/min) while maintaining the filtration accuracy. ✓5-Stage Filtration - Our upgrade 5-Stage Filtration system including coarse filter screen, double layer pp cotton fiber, coconut shell activated carbon and hollow fiber ultrafiltration membranes. which can reduce 99.99999% of escherichia coli (Test result from SGS-CSTC Standards Technical Services Co., Ltd.Ningbo Branch, Test Report NBF21-004693-01, Date: 02 Jun 2021), and improve the taste. ✓Portable & Long Life-Span - This squeeze water filtration system consists of a water filter straw and a collapsible water bottle.It weighs just 3 ounces and fits in the palm of your hand, pocket, gym bag, backpacks, survival packs and purses. Both ends of the Upgrade straw filter are removable for cleaning to extend Longer Lifespan ensuring it provides up to 5,000 liters (1,320 gallons) of drinking water. You can take it anywhere you want conveniently. ✓Survival Gear for Outdoor Water Needs - If you want to obtain clean drinking water simply and quickly, you can use this survival gear. The mini and lightweight filtering system are ideal for recreation, hiking, camping. It’s also your good companion for scouting, domestic and international travel, emergency preparedness. Note: DOES NOT lower TDS.