Karis Aquarium Rocks-Melaleuca Stone (kg)

Biological filter mat is made from high quality material which is helpful for developing nitrobacteria,with thick filaments and hard texture,so its good as middle-laying filter material. Healthy koi need clean water! There fore both mechanical and biological filtration is needed to obtain a natural balance in the koi pond. Biological filtration removes toxic ammoniac and nitrites by meansof bacteria. The righer filter medium gives a large specific surface area for the bacteria to attach to and simultaneously allows sufficient flow of water through the filter without clogging. -good water resistance,light resistance,excellent water and air permeability,flame resistance - washable ,recyclable many times - durable -size: 200x100x3.8cm