Gravity filters used to be painfully slow, but the Befree Gravity can reach up to two liters per minute. All you need to do is fill the bag with water and let it flow. Thanks to its 0.1 micron filtering size, it removes bacteria, cysts and sediment. Depending on the quality of water, the filter element has a lifespan of approz. 1000 liters. As this is a Katadyn product, you can count on the availability of spare parts - just get a new filter element once you've worn out the first one. - A strap helps you carry and hang the bag - The EZ-Clean Membrane filter is easy to clean by sloshing around - The package contains a 3 liter bag, filter element and quick connectors *Note!* A water filter or purifier tablets cannot remove the toxins created by algae bloom, and therefore do not make water containing said toxins safe to drink.