0.1 micron ABSOLUTE Hollow-fiber membrane filter removes 99.99999% of all bacteria, such as salmonella, cholera and E.coli; removes 99.9999% of all protozoa (parasites), such as giardia and cryptosporidium. The filter also removes 100% of microplastics. The CNOC 2 liter (64 ounce) bladder is made from extra-durable TPU with a wide mouth opening for fast, easy filling. TPU bladder is BPA free and FDA Approved.The Sawyer Squeeze Filter is reusable and easy to clean, lasting up to 100,000 gallons. The fiber walls inside Sawyer's hollow fiber membrane filters are thicker, making them stronger than other typical hollow fiber membrane which allows for more rigorous backwashing. The system weighs less than 6 ounces and includes a cleaning coupling and cleaning plunger. Included1 Squeeze Filter1 CNOC 2 liter (64 ounce) bladder, blue1 Cleaning Coupling1 Syringe