Oase BioMaster Spares Filter Foams and Media Carbon Pre-Filter Aquarim Fish Tank

Genuine Oase Pre Filter Foams set, suitable for the BioMaster Aquarium Filter. The Oase BioMaster Aquarium Filter has a selection of Foams and Pre Filter media to help keep the water at its best as it passes through the system. When it comes to selecting filter foams, PPI is important. PPI or "Pores per Inch" , indicates the amount of holes per inch in a foam. The higher the count the more fine a filter foam it is. While the lower the amount the more coarse the material becomes.