[20 mesh filter bags]: delivered with 20 filter bags (10 black+10 white), enough for your daily use and replacement, improves water quality and the efficiency of the filter media. Size: 15x20cm. [Durable and corrosion resistant]: the filtering bag is in polyester. Do not be blocked by bubbles, odorless and without danger for fish. Our plastic zipper does not rust easily, will serve you for a long time. [Large space and fine mesh]: Filtering bags with zipper have more space than that with tightening cord. Practical to replace the filtering material and will not overflow. About. 1 mm mesh, suitable for most filter media. [Strong filtering capacity]: filter bags for aquarium help you filter impurities in your aquarium, purify water quality and prevent bacterial growth. Provide a better environment for aquatic life. [Large use]: filter bags are perfect for the aquarium, the garden, the aquariums, the swimming pool and the pond. Suitable to contain active charcoal, bio-ball, zeolith,
