The 3 in 1 IQ media combines 3 types of filter material to provide optimum filtration. The white wool known as the mechanical filter helps to trap large particles and waste. Activated carbon serves as a chemical filter that helps to remove odours and colouration in water. The bio glass is commonly used as a biological media to cultivate biological bacteria in the aquarium for good water quality and clarity. Suitable for both freshwater and marine aquariums. Includes white wool; active carbon and bio glass balls.