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The Horti-Control Dust Shroom(tm) Is a patent pending reusable foam filter element designed to keep dust, dirt, bugs, mold, bacteria etc out of indoor gardening areas and air cooled reflectors. Horti-Control teamed up with UNI Filter, the world leader in reusable foam filter elements to design a filter for indoor gardeners. This revolutionary product will keep your air cooled reflectors dust free and keep mold and harmful bacteria out of your garden!