Filter Bio Sponge XF-31801A(100*100*5cm)Black
A 20 PPI (Pores Per Inch) bio sponge filter is a type of aquarium filter media known for its coarse, open-celled structure. This means it has larger pores compared to finer filter foams, making it suitable for trapping larger debris and providing a good surface area for beneficial bacteria to colonize. The "20 PPI" designation indicates that there are 20 pores or cells per inch of the foam.