The Boyu SF-104 Super Biological Sponge Filter is a simple internal filter that works with the power of any air pump connected to it by means of a flexible hose. It can also be used as a prefilter for external filters or powerheads. Sponge filters provide suitable mechanical and biological filtration, according to the size of the filter and the bio load of the aquarium. They are cost-effective as they consume only a tiny amount of power to pump the air needed, supplying the water with much-needed oxygen. The Boyu SF-104 Super Biological Sponge Filter is ideal for breeding, especially for discuses and other small fishes. It is suitable for up to 250-liter tanks