Hagen Bio-Max Insert for AquaClear 20/Mini

AquaClear 20 BioMax Filter Insert provides an optimal environment for beneficial bacteria growth. Reducing ammonia and nitrite levels, it increases biological filtration efficiency by 30%. Exclusively designed for the AquaClear 20 Power Filter, the insert is safe for fresh and saltwater aquariums. Net Weight: 2.1 oz (60 g).