Aquarium Automatic Vacuum Cleaner, Electric Gravel Cleaner Suitable for Medium and Large Aquarium f54 Ideal for complete aquarium cleaning or quick maintenance. But it is not suitable for cleaning fine sand Easily removes residue from the substrate without disturbing the lower layer of gravel. Please pay attention to the usage way in the video and detail page. Improper use can cause blockage. The automatic pump removes water and fills the aquarium with water. Adjust the height to suit your needs This eco-friendly product supports aquatic life with a 'green' approach This unit can be used in freshwater aquariums and salt water with a water depth of up to approx. 70 cm Product Aquarium vacuum cleaner Ideal for cleaning fast and efficient, it can reduce and simplify maintenance time. It effectively removes trash and other harmful particles without disturbing the lower gravel layer. Take care of your aquarium and aquatic life in a perfect way, make your filter work better and keep your fish and plants in good condition. Used as a vacuum cleaner and a system to change the water Removes waste and other harmful particles Does not disturb the gravel layer Designed for medium and large aquariums: over 40 cm in height The extension nozzle can be used for deeper aquariums Tilt it to better clean gravel, change water and remove waste. You will be able to clean the aquarium without any mess! Always keep the pump completely submerged, otherwise it will stop working. Remove the filter element. Remove the end cover pieces from both ends of the filter element. Thoroughly rinse out any accumulated impurities under running water. Attention: The vacuum cleaner is suitable for freshwater and saltwater aquariums with a depth of of water up to approx. 71 cm. The grain size of the aquarium gravel should not be less than 2 mm. Not suitable for cleaning a sandy bottom. Depending on the depth of the aquarium, you can add the extension tube or the extension nozzle. The pump must be positioned below the minimum waterline before starting it. If the impeller of the pump is blocked by debris, please loosen the impeller nut counterclockwise and remove the cover , then clean the debris from the inside. It is recommended to change up to a maximum of 25% of the total water in your aquarium every 2 to 4 weeks.