Biological and viral water filter. Gravity powered filter system requires no hand pumping. Includes 5-gallon bucket, 0.02 micron absolute water purifier, adapter and hose, filter 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.