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Inexpensive and versatile media bags made of 100% polyester. Fine Mesh top drawstring makes opening and closing the bag a cinch. 800 micron fine mesh bag holds your favorite filter media. Use in power filters, canisters, or wet/dry filters. Self-Fastening has a high quality self-fastening closure that makes filling and refilling easy. 3/16″ coarse mesh holds various types of filter media including activated carbon and other coarse chemical and biological media. Both great for fresh and saltwater aquariums.