WDEFUN Aquarium Filter Media, 300 ml 2 Packs with Free Mesh Bag Organic Filtration Resin, Remove Driftwood Tannins Suitable for Freshwater and Saltwater Fish TankBrand: WDEFUN Color: white Features: ENHANCE WATER CLARITY This filter media is an organic filtration resin which is developed to remove nitrogenous compounds and waste produced by fish, corals, and even plants, making your water crystal clear. FOOD GRADE RESIN PROVIDES PURE WATER This special filtering material is not a mixture of ion exchangers or adsorbents, but a unique macro porous synthetic polymer that removes soluble and insoluble impurities