Tezos BIOM , a highly effective Bio Media is now available in 300 GM pack. With macroporous surface area it helps Bacteria to host and propagate. Totally inert Bio Media which does not break down. Large surface area for Bacteria to propagate Macro-porous surface are to to support both Nitrifying and De Nitrifying Bacteria, Reusable, For better space management, its comes with long lasting net bag Directions for use Rinse with clean water before the first use. Clean periodically to remove the clogged materials from micropores. Place the net bag on the filter bed under the water flow.