The Katadyn Vario Microfilter is the first water filter that is adjustable for different conditions. It combines the two leading technologies into one high performance pump - ceramic for longer life and pleated glassfiber for easy operation. The Vario is the highest output water filter available plus it has replaceable carbon to keep water tasting fresh. In dirty water conditions, a ceramic disc protects the primary filter. In normal water, it is easily adjustable to provide maximum water output. It produces massive quantities of water in most water conditions yet easily adjusts to protect the cartridge when water is dirty. The Vario also has a unique feature that allows the internal carbon to be replaced, reducing chemicals and always keeping water tasting fresh. It also attaches directly to a Nalgene® Bottle or to hydration systems. Dimensions: 7.5" x 4". Weight: 15 oz.