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The CleanStream filters 4 liters of water in just 2.5 minutes without a single pump stroke. Simply fill up the “Dirty” 4L reservoir, connect it to the rest of the system via the handy quick-disconnect fitting and hang the whole system from a tree, your car, or anywhere. Then go and cook dinner, chat with friends, set up your tent or whatever. With no moving parts you get a quick, 4-second clean by simply reversing the height of the reservoirs and a full 8-liter capacity provides on-demand water for any group size.