Product description Size: 300l: 39*36.5*124mm 600l: 46*42*134mm 1000l: 55*45*154mm Colour: Black Material: Plastic Plug: Round plug (European plug) 1. AQUARIUM FILTER WORKING PRINCIPLE: Dirty water enters from the filter side; The water will first pass through the 3 layers of filter plates; Then water passes through the sponge filter box again; Clean water enters the filter inside, then by water pump flows out through front outlet or rotatable outlet tap. 2. WATER CHANGE FUNCTION: Innovative water exchange design allows for quick and easy water changes. Rotate the outlet tap to change the water out of the tank by the included hose. Only part of the water is replaced. The fish tank filter supports proper aquarium maintenance, ensuring not all water is removed, allowing fish to adapt. 3. LANDSCAPING & OXYGENATION: Pull out the outlet tap; Remove the top cover; Take out the small accessories; Install back cover and outlet tube; Attach the fountain accessory head on the water change tube. After connecting to power, the aquarium filter creates a fountain-like effect. The flowing water helps increase dissolved oxygen levels in the aquarium. 4. UNIQUE DESIGN: This water change filter pump features a design. In addition to providing efficient filtration for a clean and clear fish tank, the rotating outlet tap supports water change functionality, making the filter versatile. The additional outlet plug enables a small fountain effect, enhancing visual appeal while filtering.