These Filter Media Bags come in a choice of sizes, so you can use them inside either an aquarium or pond filter. 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 bag comes with a handy zipper to insure none of the media falls out, and then when maintenance is required you can simply unzip it and replace with ease.
These bags come in a range of sizes:-
Large bag - 30x30cm
Medium bag - 20x30cm
Small bag - 15x20cm