BioCeraMAX 1200 is a unique element intended for biological filtration of water in freshwater and seawater aquariums, paludariums, aqua-terrariums and terrarium pools. It has the form of cylinders made of fine-pore sintered glass ensuring exceptionally high filtration surface. The internal surface of pores becomes home to useful strains of nitrifying bacteria of the genera Nitrosomonas and Nitrobacter. These microbes burn in their vital processes metabolites toxic for fish: ammonia (Nitrosomonas) and nitrites (Nitrobacter) – oxidizing them to nitrate form, far safer for aquarium residents.