EHEIM bioMECH Mechanical-biological filtration media for integrated water treatment The bioMECH is intelligently designed: it captures and retains large and small dirt particles in dirt retention pockets. At the same time, its precisely designed pore structure provides colonization for purification bacteria, ensuring reliable biological decomposition. The material is pH-neutral and contains no water-hardening substances. EHEIM bioMECH is washable and reusable multiple times. A filtration media specifically designed to purify water mechanically and biologically at the same time. The material is pH-neutral and free of water-hardening substances. Reusable (wash carefully to avoid destroying bacterial colonies). In general, mechanical filtration materials capture large dirt particles. Biological filtration materials provide the right conditions for bacterial colonies to colonize: purification bacteria feed on and transform dirt particles. Specifically, clear and healthy water and stable water values are achieved in the aquarium. Our latest development is a filtration media that combines mechanical and biological functions. Mechanical: Yes Biological: Yes Absorbent: No Chemical: No Mesh bag: No Freshwater: Yes Marine water: No Width: 140 mm Height: 177 mm Depth: 73 mm