Aquaclear 20-Gallon Biomax 20-Gallon Foam Inserts, 3-Pack

AquaClear 20 Foam Filter Insert provides mechanical filtration by trapping particles and debris. In addition the AquaClear 20 Foam Filter Insert offers powerful biological filtration. It is designed to fit the AquaClear 20 Power Filter.The AquaClear 20 BioMax Filter Insert provides an optimal environment for beneficial bacteria growth. It works to reduce ammonia and nitrite levels in your tank and it increases biological filtration efficiency by 30 percent. The AquaClear 20 BioMax Filter Insert is made exclusively for the AquaClear 20 Power Filter.