Save your aqua friends from any dirt particles with the Marina i25 aquarium filter. The compact yet powerful internal filter can be used with any goldfish aquarium or tropical tank of up to 25 litres. It effectively filters water through 3 stages of filtration, providing a cleaner and healthier aquarium environment. The uniquely designed power cartridge (included) enables the water to enter from the centre for an effective mechanical, chemical and biological filtration process. An outlet then from the polyester foam layer leaves all trapped debris inside the cartridge, ensuring your aquarium water is crystal clear. This way, it enhances the water quality, and a waterfall spout allows continuous oxygenation.