These Filter Media Bags come in a choice of grades, so you can use a selection of media within them. The coarse grade bag, is ideal for use with biological filtration, such as bioballs, either plastic or ceramic, and other larger items, like charcoal, or Alfagrog.
The finer grade bag is better suited to smaller media, such as carbon or zeolite. Both bags come with drawstrings so your media doesn't fall out and they can be partly filled and used in smaller spaces, like filter compartments, or filled right up for sump use.
These bags come in a range of sizes:-
Large bags - 50x60cm
Small bags - 30x55cm
Available in both 2mm and 4mm grades.