It can be used for aquariums fish tank.
Easy maintenance and installation.
Cut to your size easily for filter replacement.
Its multi-porous feature will avoid blockages and provide the largest adhesion area for bacteria.

• Color: Black; Material: Biochemical Cotton
• Total Size: 10 x 5cm/4" x 2" (H*D); Product Name: Bio Sponge Filter
• Package Content: 2 x Bio Sponge Filters
• Net Weight: 33g
• Inner Dia: 2.2cm/0.87"

Color: Black; Material: Biochemical Cottonuxcell