The bottle produces up to 100 gallons of great-tasting water; and is equal to 757 half liters of bottled water! For the 75% of the water consumed away from home, this is the perfect portable product! Now with BIOSAFE®, removes up to 99.99% of bacteria, virus, contaminants and pollutants found in drinking water sources using its proprietary Ionic Adsorption Micron Filtration System. Contains Iodinated Resin (EPA Reg. # 35917-2) and other proprietary media which effectively reduces virus and bacteria to six logs (99.9999%). Produces up to 100 gallons of filtered water or more depending upon the quality of the source water. Has a screw on/off fill from the top cap for easy filling. Tested by Independent laboratories using EPA/ANSI protocols and NSF Standards 42 and 53. Filter is replaceable.