Karis Bio Chemical Filter Wool Mat, 200x100x3.8cm

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 s