ONA Odor Neutralizing Agent has been solving problematic odors with great success since it arrived on the market in 1995. Formulated from essential oils, it will tackle the most difficult odors and literally eliminate them - no masking - no coverup - just neutralization and elimination. The odors are gone._x000D_ _x000D_ This reputation for effectiveness has caused hydroponic gardeners around the world to use it successfully, and they keep coming back for more.