1. Ideal Carrier for Nitrifying Bacteria: The surface is rough and porous, creating an ideal habitat for nitrifying bacteria to multiply. The rapidly multiplying nitrifying bacteria can efficiently decompose toxins in the water and improve water quality. 2. Optimize Water Flow Distribution: In the filtration system, it can evenly disperse the water flow, making the water flow fully contact with the filter media, improving the filtration efficiency and ensuring that every part of the water body can be effectively purified. 3. Robust and Durable: Made of high - quality materials, it is compression - resistant and wear - resistant. It is not easy to break or deform during long - term use and can withstand long - term scouring of water flow, reducing the replacement frequency. 4. Suitable for Small Water Bodies: The smaller size of 26mm is especially suitable for filtering water in small aquariums, small fish ponds and other water bodies with limited space, achieving a powerful biochemical filtration function in a limited space.