Alegi 180 Micron Aquarium Filter Media Fine Mesh Bag, 8In By 4In Small Resin Filters Media Bags For Fish Tank (8In 4In(4Pcs))

Our fine mesh design is optimized to work with any type of chemical filter media preventing resins from escaping into your pump. For very fine resins such as Purigen and CupriSorb use our EXTRA FINE media Bag.