Tactical BLU line parasite protection. Uses activated coconut shell carbon to help reduce waterborne chemicals, improve water taste and eliminate odors. Tested and certified to remove over 99.9% of cryptosporidium and giardiasyst. Also removes biotoxins such as microcystin. To use: attache and expand the straw, submerge the filter end into the water source and drink through the straw. Miraguard antimicrobial technology suppresses the growth of bacteria, algae, fungus, mold and mildew within the filter media. Filters 30 gallons. Weights less than 1 oz. Ideal for rucksack, go-bag or travel kit.