The last thing you want to do after hiking eight miles to camp just before sundown is waste your energy--dividing it between pumping away for clean water and trying to start a fire. Save your strength by doing both at the same time with the Katadyn Base Camp Pro 10L Water Filter. Just fill the reservoir, hang it from a nearby branch, and let gravity do the rest, freeing you up to focus on getting that fire sparked. The Base Camp Pro 10L reliably filters bacteria, cysts, and sediment at a rate of two liters per minute, so you'll have fresh water for the whole group before you can even put flint to tinder. With the water level indicator window, you'll easily anticipate when the next trip to the creek or lake needs to be made for another batch of fresh H2O. And when that time does come, just remove the tube with the simple quick release valve before heading to the source, as to prevent it from coming in contact with the contaminated water. Don't worry about that freshly purified water spilling onto the ground either, because this filter is equipped with an automatic shutoff. With regular maintenance and proper cleaning, the Base Camp Pro's Ultra Flow glass-fiber filter purifies up to 1,500 liters of water in its lifetime. However, if you don't do such a hot job of keeping the filter itself clean, Katadyn offers a One-Year AntiClog guarantee.