Large Zip Bag Durable Seams & Corrosive-Proof Zipper. 48 cm x 43 cm (19 x 17). Excellent Choice for biomedia such as Matrix no trings or Ties.

• Use Instructions: Simply place desired filtration material e.g. MatrixCarbon, PhosGuard, etc. and close using the corrosion-resistant zipper. For best results, Zip Bag and filtration media should be placed so as to maximize the flow of water through it.
• Compatible Filter Type: Carbon; Biological