JBL Micromec are sintered bio-glass balls for aquarium filters for breaking down pollutants. For use in freshwater and marine water.JBL Micromec+ biological breakdown of pollutants in fresh and saltwater aquariums: sintered bio-glass balls for the use in aquarium filters+ easy to use: use biological sintered glass balls inside the second last filter stage+ intensive water clarification through bio-filtering: microorganisms settle on the filter material and break down pollutants+ highly effective: conical tunnel pores create ideal settling area of 1500 m2/l for beneficial microorganisms+ intensive breakdown of ammonium and nitrite+ under ideal conditions also degradation of nitrate+ glass balls with approx.1.4 cm, 650 g incl. net bag for filling