How the Filter Works: GEIGERRIGS Pressurized Hydration bladder pushes the water through the inline water filter allowing you to drink fresh spring water while you are on the go. Yes, carrying a 5oz water filter on your backpacking trip is easier than loading your pack with water bottles and bladders. Filter Size: In-Line Portable Water Filter. 5.5 inches Long X 1 In. Diameter. Easily carried in our hydration packs. Weight: 1.5oz If you want to save weight on your backpacking trip then the GEIGERRIG in-line water filter will help. Filter Capacity - Gallons: Rated to Filter Up To 50 Gallons of water filtration - You now have a much greater range while hiking. 50 gallons can take you a long way! Tested and Certified: Removes >99.9% Cryptospordium & Giardia - Your hydration pack now protects you when you need to refill in the field on the hiking trail or on a two week backpacking trip. Items Needed For Use of Filter: You will need a GEIGERRIG Filter Ready Drinking Tube - Once youve purchased a filter-ready drink tube your pressurized hydration pack is now filter ready. Snap your in-line water filter while you are on your hike and you can fill your bladder with water while on the go. Filter - Coconut Shell Carbon: Activated Coconut Shell Carbon reduces waterborne chemicals, improves taste and eliminates offensive odors. Filter - Mirigard Antimicrobial Technology: Suppresses the growth of bacteria, algae, fungus, mold and mildew within the filter media. In-Line Water Filter Care:After each use fill your hydration bladder with clean water and flush the filter. After you flush the water filter, empty the water out of the filter by filling the bladder with air and force the air through the filter. Allow 24 hours to dry and store in a cool dry place