Tetra Bio Filter BF Replacement Foam for Internal Filters IN300, IN400/600, IN800/1000

Use of Tetra BF replacement Foam in Tetra Internal Filters IN ensures that the aquarium water is filtered effectively. Biologically active bacterial cultures that transform harmful nitrite into the plant fertiliser nitrate settle in the filter foam. The foam structure also carries out physical filtration, removing visible particles from the aquarium filter