Ideal for complete aquarium cleaning or quick maintenance. However, it is not suitable for cleaning fine sand. Easily removes debris from the substrate without disturbing the bottom gravel layer. Please pay attention to the usage method in the video and on the detail page. Incorrect use may cause blockage. The automatic pump removes water and fills the aquarium with water. Adjust the height to suit your needs. This environmentally friendly product supports aquatic life with a \"green\" approach. This unit can be used in freshwater and saltwater aquariums with a water depth of up to approx. 70 cm. Product Aquarium Vacuum Cleaner Ideal for quick and efficient cleaning, it can reduce and simplify maintenance time. It effectively removes debris and other harmful particles without disturbing the bottom gravel layer. Take perfect care of your aquarium and aquatic life, make your filter work better and keep your fish and plants in good condition. Used as a vacuum cleaner and a water change system. 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. Angle it to better clean gravel, change water and remove waste. You will be able to clean the aquarium without mess! Always keep the pump fully submerged, otherwise it will stop working. Remove the filter element. Remove the end caps from both ends of the filter element. Rinse thoroughly away any accumulated contaminants under running water. Note: The vacuum cleaner is suitable for freshwater and saltwater aquariums with a water depth of up to approx. 71 cm. The grain size of the aquarium gravel should not be less than 2 mm. Not suitable for cleaning sand bottoms. Depending on the depth of the aquarium, you can add the extension tube or the extension nozzle. The pump must be placed below the lowest water line before starting. If the pump impeller is blocked by debris, loosen the impeller nut counter-clockwise 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.