FILTER BIO-MAT HARD

It is made of high-quality knitted polyester and a special water-resistant bonding material.
Its special structure ensures good water penetration.
It supplies beneficial bacteria that remove toxic ammonia and nitrite.
It has a large surface area so that large numbers of bacteria can grow at a fast rate.
It is durable, easy to clean. It is the most advanced aquarium filter sponge on the market.