THE ROUGH-NECK GRAVITY FILTER SYSTEM--The most advanced Water Filter on the Market! Using the same Nano Technology as used In SPACE TRAVEL and also the Space Shuttle. This Water Filter/Purifier filters Virus, Bacteria, Cysts,Heavy Metals, & Pesticides clear down to a Hormone Level. Our Nano Filter can replace all Gravity Filters on the market with much better flow rates & Superior results. (Same Nozzle Size) Plugs are also available since only one filter is necessary because of high flow rates.