Eheim bioMECH ist a new meachnical-biological filter medium for highly efficient water treatment. Eheim bioMECH ensures excellent mechanical filtration with special dirt-trapping pockets and faster and safer decomposition of toxins due to the optimum pore structure.+ special pockets to trap dirt guarantee that both large and small dirt particles are trapped effectively+ optimum pore structure ensures faster and safer decomposition of toxins+ pH neutral, will not harden the waterEheim bioMECH is reusable and easy to clean, simply washed under lukewarm water. The filter material is suitable in fresh and marine water aqurium.