With no pumping and no chemicals required, the Sawyer Point Zero Two purifier with bucket adapter delivers 5 gal. of clean drinking water in under 45 min. Simply install the purifier to nearly any plastic bucket not included and youre setup with a large-volume gravity purification system. 0.02-micron hollow fiber membrane purifier physically removes particles, protozoa, bacteria and viruses while maintaining a good rate of flow. All Sawyer water filters and purifiers exceed Environmental Protection Agency EPA recommendations for removal rates. Purifier is fully field maintainable to ensure a fast flow of water system includes a back wash bulb and a faucet adapter for thorough back washing in the field and at home. All Sawyer water filters and purifiers come with a Million Gallon Guarantee, essentially eliminating the need to ever have to replace the purifier cartridge. Includes hollow fiber purifier, tubing, bucket adapter, hole cutter, faucet adapter, filter cleaner, filter hanger, and assembly instructions. Plastic bucket not included.