Activated Bio Granules are made by powerful squeeze and calcined at hightemperature,have an Intranet system structure and fine microporous.Theaccumulation ofa large number of active biological beads can provide beneficialbacteria breeding with incomparable specific surface area.The electronegativityof quartz sand and diatomite raw materials can make the filter material producenegative ion, effective adsorption of metal ions in water, soften water quality.Activated Bio Granules can be used as a good aquatic sand by a large number ofaccumulation,adhesion and breeding nitrifying bacteria and anaerobicbacteria.Use neutral natural material, it is an ideal aquarium filter media for thefish which like the partial neutral to acid PH