Achieve advanced aquarium filtration with the Oceanmax High-Efficiency Bio Sponge (100x100x4cm, PPI 30). Engineered for maximum surface area, this dense, porous sponge captures fine particles and fosters beneficial bacterial growth. Ideal for both mechanical and biological filtration, it suits a variety of systems and is durable, washable, and long-lasting. Keep your freshwater or marine tank clean and balanced with this excellent filtration choice.