Phresh Filters are state of the art carbon filters that process the air through its RC-48 Australian activated carbon bed making it clean of dust, foreign particulates, organic compounds and odours. These filters are half the weight, last twice as long and have the largest selection of sizes to choose from. They are used in research labs, plant breeding, tissue culture, indoor gardening, backyard & commercial greenhouses making them the ideal candidate for serious hobbyists and commercial applications alike. We have a few sizes left in stock all available at a price 25% lower than RRP. Once they're gone they're gone!