The Katadyn Vario is a powerful companion in a small, lightweight package. With it, you can quickly treat up to 2 liters of water per minute with less effort than you dreamed possible thanks to its Dual Piston Technology. It is perfect for a small group of 5 of less. Choose between higher 2-liter/minute output or lifespan-extending 1-liter/minute output. The technology Katadyn Vario uses consists of three filter levels: a high-performance glass fiber filter, a ceramic pre-filter that can be adjusted individually according to the cloudiness of the water, and active charcoal for eliminating odors. A trio of filters scrubs water to confidently purge the bad stuff: Activate a ceramic pre-filter with a quick turn to conquer dirtier water so the durable glass fiber pleated filter inside lasts even longer. Plus, active charcoal gets rid of odors. Together, you get fresh, tasty refreshment you can trust.