Description: Multi-layer three-dimensional weaving, mesh cloth and fiber biochemical layer combination, effectively remove impurities and decompose tiny particles. The filter pad adopts a honeycomb shape design, which has strong water permeability and absorbs impurities. Scientifically filter bacterial impurities, establish a nitrification system, and stabilize the cultivation of nitrifying bacterium. The aquarium filter media can be cut to any size, meet all your requirements and save more money for you. Our aquarium filter media is very suitable for freshwater or salt aquarium, this aquarium filter can be used as a fish tank accessories, pre-filter for wet/dry filters, sewage tanks, reef tank, pond, fish and vegetable symbiosis systems etc. Can be used again after cleaning. Specification: Material: Cotton Size Chart: 40x50cm/15.75x19.69inch 120x30cm/47.24x11.81inch Thickness: 2cm/0.79inch Package Includes: 1 Piece Fish Tank Filter Media Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!