Bring this handy device along to ensure you always have access to clean drinking water. It easily removes 99.99% of pollutants and contaminants found in drinking water sources using its proprietary Ionic Adsorption Micron Filtration System. The 28 oz size is ideal for filtering and drinking a generous amount of clean water and can filter up to 100 gallons of water. This product has been tested by Independent laboratories using EPA and NSF protocols. Here are some key features of this new filtration system: Easy to Purify, Carry and Drink Clean Water  Produces up to 100 Gallons of Clean Water Removes 99.99% of Pollutants and Contaminants Holds up to 28 oz