Filter media are an important part of aquatics. Filter wool is designed to absorb large particles of dirt. The different filter sponges clean the water from chemical pollution, reduce nitrite or clean the water using live bacteria. JBL Clear Mec plus Pads ensure crystal clear water without algae growth. The foam edge allows the water to flow slowly through the centrally located pollution remover. The set contains: 2 foam inserts with recess (20 ppi) 1 x nitrite, nitrate & phosphate remover in a net pouch Product picture: