The Last Filter Media Bag You'll Buy Cheap stitched media bags split at the seams, spill resin into your filter, and fall apart the moment you try to regenerate them in bleach. Fine media escapes and clogs your system. The Bag is a welded mesh filter bag built to hold bulk aquarium filter media like Seachem Purigen. Its 180 micron interlocking mesh holds even the finest resin, while durable non-stitched welded seams and a resealable locking closure make it easy to reuse. It is chemically inert and resistant to bleach, caustics, acids, and other harsh exposure, so it survives media regeneration that destroys ordinary bags. The Bag is made by Seachem Laboratories, the chemistry-driven company founded in 1979 in Madison, Georgia, and designed as the ideal companion to Seachem's high-capacity filter media. That same materials expertise is why The Bag is chemically inert and built to survive the bleach and acid soaks that regenerating media demands, where flimsy stitched bags fail. Fill The Bag with your chosen chemical filter media, such as Seachem Purigen. Close it with the resealable locking closure. Position it so aquarium water flows through the filled media bag. Stop rebuying flimsy bags. Add to cart. What It DoesThe Bag is a welded mesh filter bag for holding bulk aquarium filter media, featuring a 180 micron interlocking mesh that holds even the finest resin media, a resealable locking closure, and durable non-stitched welded seams for long-lasting use. It is chemically inert and resistant to bleach, caustics, acids, or other harsh environmental exposure likely to take place during regeneration of filter media, making it great for use with media that regenerate in bleach. DirectionsSimply place desired chemical filter media such as Seachem Purigen and close The Bag using the resealable locking closure. For best results, make sure aquarium water flows through the filled media bag. Available Sizes5" x 10" Why Seachem The Bag Holds even the finest media: its 180 micron interlocking mesh retains fine resins such as Purigen so they do not escape into your filter. Built to be reused: a resealable locking closure lets you refill and reseal it, so it is not a single-use bag. Survives regeneration: chemically inert and resistant to bleach, caustics, and acids, it withstands the harsh soaks that destroy ordinary stitched bags, making it ideal for media that regenerate in bleach. Durable construction: non-stitched welded seams resist splitting at the edges, so it holds up over the long term. Best ForFreshwater and marine aquarists using bulk chemical filter media such as Purigen, especially those who regenerate their media in bleach and need a reusable bag that survives the process. Fits canister filters, media chambers, and high-flow filter areas where the filled bag can be placed in the water flow. FAQ Can I reuse it and regenerate media in it? Yes. It has a resealable locking closure for refilling, and because it is chemically inert and resistant to bleach, caustics, and acids, it withstands the regeneration soaks that destroy ordinary bags. Where does it go in my filter? Fill it with media, close the locking closure, and position it so aquarium water flows through the filled bag, such as in a canister filter, media chamber, or high-flow filter area. Freshwater or marine? Both. The Bag holds chemical filter media for freshwater and marine systems alike.