ALEGI Large Filter Media Bags,Aquarium Mesh Bags with Plastic Zipper,White Net Bags for Bio Balls, Ammonia Remover 17.8" by 13.5" (4pcs)

4 Pcs Aquarium Filter Media Bag. Size: Approx 45 x 35 cm/17.5“ x 13.5“. Zipper is plastic, You do not worry it would rust and produce harmful substances, it great for use in canister filter system. Versatile media bags are designed for filtration applications, This bag is good for holding large media items, such as Pellet carbon, bio balls, bio ceramic rings, crushed lava rocks, zeolite, gravel. Not for fine, granulated carbon charcoal media. Our large filter media bag close tight to prevent loose media from potentially causing damage to your water pump or power filter's motor. The Mesh Bags with Plastic Zipper is 100% nylon and completely safe for both fresh and saltwater aquariums.