Fluval LIV Filter Cartridge offers a 3 in 1 solution. Includes: Bio-Node is a premium-grade biological filter media that provides superior filtration and helps reduce and control ammonia and nitrate levels for a healthy nitrogen level in the water. Polyester Pad helps clear water quickly trapping waste and debris as well as Premium Carbon which is highly effective at removing heavy metals, odors, discolorations, organic contaminants, and pollutants from aquarium water.