The Interpet Internal Aquarium Fish Tank CF2 Cartridge Filter is a high-quality internal filter designed for freshwater aquariums with a capacity of 35 litres. With a flow rate of 480 litres per hour, it effectively filters and cleans the water in your aquarium, providing a healthy environment for your fish. The filter cartridge is easy to replace and the compact design makes it suitable for tanks with limited space. The Interpet brand is known for its reliability and this filter is a great choice for maintaining the cleanliness of your aquarium. its hardly been used has i got a bigger tank, has new cartridge in