4" x 8" 300 Micron Polyester Filter Media Bags (5 pack) with sewn in pull ties.

Our 300 Micron Aquarium Filter Bags are meant for filtering out coarse solids (approximately the size of large dust mites) while protecting the beneficial bacteria colonies of your biological filter media. These high quality aquarium media bags will enhance the performance of your media while keeping them contained, which works great with any sump system. Emperor Aquatics, Inc.'s Aquarium Polyester Filter Media Bags are easy to clean and are reusable.