The JUWEL coarse filter sponge is used for the mechanical and biological filtering of your aquarium and is thus an essential component of the JUWEL filter system.
The coarse pore structure offers a large surface area and guarantees a relatively high and even flow rate of the water. This makes the sponge particularly suitable for biological filtering in the aerobic area.
The open pores of the JUWEL filter sponge are reached without the use of chemicals and are therefore residue-free.

Properties of the JUWEL filter sponge, coarse:
• Optimal mechanical and biological filter properties
• The homogeneous structure ensures an even flow
• Without chemical residues
• Suitable for fresh and salt water