Ocean Free Bio Foam Sponge FilterInnovative sponge filters for small or breeding tanks, where little water disturbance is needed. Provide exceptional room bacterial colonisation. Multi-layered to give the best possible filtration and yet gentle enough not to create too much turbulence. Bio-Foam can be removed, rinsed and re-used.Simply connect to an airpump, powerhead or hang on filter with standard airline (not included).The whole Bio-Foam area is efficiently used as a filter. No dead spots present.Can be used on different filtration installations.Suitable for Discus, small tropical fishes or fry tanks.Multi-layered to give the best possible filtration and yet gentle enough not to create too much turbulence.Bio-Foam can be removed, rinsed and re-used.Sizes:Baby- for up to 40L Size: 5.5cm diameter x 7.3cm high (excluding clear riser tube - add approx. 5.5cm)BF1- for up to 100L Size: Size: 8.5cm diameter x 9cm high (excluding clear riser tube - add approx. 7cm)BF2- for up to 200L Size: 8.5cm diameter x 14cm high (excluding clear riser tube - add approx. 7cm)BF4- for up to 380L Size: 10.5cm diameter x 14cm high (excluding clear riser tube - add approx. 7cm)Jumbo- for up to 680L Size: 15.5cm diameter x 19.5cm high (excluding clear riser tube - add approx. 15cm)