In-line portable water filter. Rated to filter up to 189 Litres (50 gallons). Removes greater than 99.9% of Cryptospordium and Giardia. Activated Coconut Shell Carbon Reduces waterborne chemicals, improves taste and eliminates offensive odors. Mirigard Antimicrobial Technology suppresses the growth of bacyteria, algae, fungus, mold and mildew within the filter media. 5.5 Inches long. 1 inch diameter. Connects in-line with a Filter Ready GEIGERRIG drinking tube. Requires a Filter Ready GEIGERRIG drinking tube.