*Note that this product is going through a packaging change and you may receive new or old product* The Nylon Media Bag is ideal for use with most filters. Simply fill the bag with bulk media of choice and place into desired media compartment. Nylon mesh with convenient closure Can be used with most loose filter material (i.e. carbon, peat, bio-rings, etc.) Allows for easy installation and removal from filter For use in freshwater or saltwater aquariums 2-Pack Available Sizes: 20, 30, 50, 70 or 110