The innovative and natural way to keep indoor air clean and fresh. Should we bring fresh air in? What is in that outside air that we are bringing in? It is full of all kinds of things: smoke, automobile exhaust, industrial waste and byproducts, etc. With Hygienic Aire, these problems have a solution! Hygienic Aire takes the existing indoor air and cleans it up. Naturally. Simply place the jars of Hygienic Aire in strategic places of the home or office building and let it go to work for you. Placing a small jar in a more confined area such as a laundry room or closet, freshens the air. A larger size jar, placed in the furnace air return, will allow the beneficial tea tree oil to be disbursed throughout the building. After opening the jar, it will, on average, last 30 - 45 days in your furnace or air ducts. As it disperses throughout the building, it tends to be absorbed by the porous materials it comes in contact with, safely and without harming them. As this happens, Hygienic Aire continues to keep the air smelling fresh after the material in the jar has dissolved. In this way, it remains effective for another 30 - 45 days more. That's an average of 60 - 90 days of coverage!