The Japanese Mat (1.2M X 1M) Top Grade is a high-quality filtration medium designed for use in koi ponds and professional aquarium systems, offering exceptional mechanical and biological filtration capabilities. Measuring 1.2 meters by 1 meter, this large mat can be easily cut to fit any filter size, making it highly versatile for a wide range of applications. Its dense, porous structure promotes the growth of beneficial bacteria, essential for maintaining a healthy aquatic environment, while effectively trapping debris and particulates, ensuring crystal clear water.