Filter bags made of fine mesh are perfect for fine filter media, such as activated carbon or phosphate remover, because they prevent soiling of the material. For coarse filter media JBL now provides fitted coarse filter bags with large mesh size, so that any soiling does not clog the bag but reaches the filter material.
JBL’s answer to this and now available: fine bags (JBL FilterBag fine) and bags with coarse mesh (JBL FilterBag wide). One pack always contains two bags with practical sealing clips. The main benefit of filter material bags is that the aquarium owners can remove the filter material from their filter completely and easily – in seconds, in fact. Trying to do this without a bag would kill their nerves and seriously damage their health!