Nasmodo aquarium filter sponge Biological Filter Sponge for Aquarium Fish Tank Sponge Aquarium Filter  (Biological Filtration for Salt Water and Fresh Water)

It is excellent water permeability. and Lightweight & softness design. It can be used again after cleaning. and cut any sizes as your needed. A good item ensures your filtering effect. Dense shape makes it effective to avoid residue.Suitable for using in freshwater and marine water. No harm to aquarium creature, non-toxic, safe to fish,easy to clean. The ecological fiber blanket uses vertical arrangement structure, and has abandoned the biochemical cotton hole structure. The multi-functional sandwich structure disperses the water flow, forms more rapids, increases the oxygen content in the water. At the same time, increase the rate of nitrifying bacteria propagation, and the large surface area helps to establish nitrification system.