Hydrofarm offers Active Air™ Filters that offer features and performance at a value price.  All filters are maintenance free and feature long-lasting activated virgin charcoal that keeps your air odor-free. They contain corrosion-resistant galvanized steel, a changeable Velcro pre-filter to collect dust and airborne particles and shrink wrap to protect the charcoal and keep the filter clean. Active Air Filers feature high grade activated charcoal to guarantee maximum odor control and large surface areas and 2.5” thick carbon bed results in optimum odor control and maximum efficiency. No maintenance is required. The charcoal is carefully packed to insure a consistent and even air flow throughout the carbon bed for a full usage of the filter and its durability. There is a pre-filter to remove airborne particles and dust that is fitted with Velcro for easy removal. To find a Hydrofarm Authorized Retailer near you visit http://www.hydrofarm.com/.