This filter is designed to work with Geigerrig’s Pressurized Hydration engine. It pushes water through this Geigerrig In-Line Crypto Filter, producing fresh spring water while on the go. At 1.5 oz., it’s easier to carry than loading your pack with water bottles. It will filter up to 50 gallons of water and removes >99.9% of cryptospordium and giardia. Activated coconut shell carbon reduces waterborne chemicals, improves taste and eliminates offensive odors. Materials suppress the growth of bacteria, algae, fungus, mold and mildew within the filter. Made in USA.