Dymax Blue Bio Filter Sponge for Aquarium - 32 x 12cm (2 Pack) - High-Efficiency Mechanical & Biological Filtration for Fish Tanks, Ponds & Aquatic Systems

The Dymax filter sponge is made of supreme quality material that can use for both biological and mechanical filtration. It is a non-toxic filter material that helps to filter lose particles, promote beneficial bacteria as well as to breakdown toxic ammonia and nitrate.