The Sagan Life AquaBrick Water Purification System takes any non-salt water and makes it safe, clean drinking water! Perfect for the outdoorsy individual, the filtration system purifies up to 700 gallons of dirty water. Additionally, this well-rounded emergency purification system will quickly become irreplaceable on camping trips or for outdoor/mobile living. To work the filter, all you have to do is fill the container with water. Next, insert the filter and straw and screw on the lid. Finally, squeeze the hand pump a few times to pressurize the unit. It’s that easy to have clean, fresh drinking water wherever, whenever.