Interpet Internal Power FilterInterpet PF Mini Internal Aquarium Power Filter The Interpet PF Mini is a compact and efficient internal filter, perfect for small aquariums up to 40 litres. It provides effective filtration to help maintain clear, healthy water for fish and aquatic plants. Key Features: Three Stage Filtration Combines mechanical, biological, and chemical filtration for thorough cleaning. Adjustable Flow and Direction Allows control over water movement and direction