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 Giardia cysts. Also removes biotoxins such as Microcystin. To use: attach 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. Weighs less than one ounce. Ideal for rucksack, go bag, or travel kit.