Product description<br/>size: 300l: 39*36.5*124mm<br/>600l: 46*42*134mm<br/>1000l: 55*45*154mm<br/>Colour: Black<br/>material: plastic<br/>Plug: round plug (European plug)<br/>1.【AQUARIUM FILTER WORKING PRINCIPL】: ①Dirty water enters from the filter side ②The water will first pass through the 3 layers of filter plates ③Then water passes through the sponge filter box again ④ Clean water enters the filter inside, ⑤Then by water pump flows out through front outlet or rotatable outlet tap.<br/>2.【WATER CHANGE FUNCTION】:Our 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 . But only part of the water can be replaced. fish tank filter meets the scientific fish farming, all the water will not be pumped away, allowing the fish to adapt.<br/>3.【LANDSCAPING & OXYGENATION】: ①Pull out the outlet tap ②Remove the top cover ③Take out the small accessories ④Install back cover and outlet tube ⑤Install the fountain accessory head on the water change tube. After plugging in the power, aquarium filter will be an effect similar to a small fountain. The flow of water will also increase dissolved oxygen in the aquarium.<br/>4.【UNIQUE DESIGN】: This water change filter pump is the latest design. In addition to the powerful filtering function to bring you a clean and clear fish tank, its unique rotating outlet tap can meet your water change function needs, fish tank filter is multi-purpose. The additional small outlet tap plug create a small fountain effect in the fish tank, adding visual enjoyment while filtering.