The UZ-1 is used and trusted around the world because it simply is one of the best when it comes to gravity water filter systems. Besides being globally certified and independently tested by the World Health organization, the UZ-1 is durable, effective, affordable, and long-lasting. It's unmatched versatility makes it a must have. Whether you want to prepare for emergencies and natural disasters, are looking to take a water filter camping, hiking and backpacking, or simply need to replace the filter in your UZ-2 gravity water filter system, or UZ-BP Backpack System, the UZ-1 is the answer. No matter your situation, you can trust in the power of Uzima.