Air Driven Sponge Filter For Aquarium Fish Tank Bio Foam Filters Breeding Various Sizes (Small (For upto 40L))

Aerobic bacteria colonise the sponge providing a bacterial surface to facilitate the nitrogen cycle. In addition, the sponge traps larger waste particles and mechanically cleans the water without trapping baby fish, keeping a crystal clear water tank. The filter can be easily detached for cleaning. Rinse it every 2-4 weeks with aquarium water only. Avoid washing it in tap water! The small sponge filter measures 7.5cm Diameter x 6.5cm Tall. It is suitable for aquariums up to 40 litres. The medium sponge filter measures 12cm Diameter x 6.5cm Tall. It is suitable for aquariums up to 120 litres. The large sponge filter measures 12cm Diameter x 11.3cm Tall. It is suitable for aquariums up to 240 litres.