Phresh® Filters are state of the art carbon filters that scour the air to make it clean of dust, foreign particulates, organic compounds and odors. Competitively priced, Phresh® Carbon Filters are half the weight, last twice as long and have the largest selection of sizes to choose from. Phresh® Filters rely on the unique properties of RC-48 Australian activated carbon. They are used in research labs, plant breeding, tissue culture, indoor gardening, backyard & commercial greenhouses for their total airstream filtration characteristics. Phresh® Carbon Filters are professional-grade systems designed to meet the demands of serious hobbyists and commercial applications.