Biological and viral water filter. Gravity powered filter system requires no hand pumping. Includes 0.02 micron absolute water purifier, adapter and hose, filter cleaner cleaner, filter hanger, and hole cutter. Flow rate: 5 gallons in less than 12 minutes. Removes viruses, bacteria, and protozoa. Sawyer Viral Purification removes viruses mechanically at a 5.5 log -- 99.9997% -- rate, exceeding EPA and NSF recommendations. BPA-free. Removes bacteria and viruses at up to 170 gallons per day when fitted onto a 5-gallon bucket. Bucket NOT included. See #34092B for item with bucket.