Usage Instructions Please use the correct voltage. Please use this electric gravel cleaner in fresh water or sea water. Do not use it in flammable and corrosive liquid. Do not use if the power cord is damaged. Do not use above 35°C and below 0. as this will damage the pump. -Easy to install and use with a variety of accessories. It can be flexibly transformed for a variety of purposes. - Normally, it can be placed in the aquarium or circulating water and add oxygen consumption. Features 1. The powerful suction of the impeller absorbs the contaminating waste in the gravel with the water flow and quickly and easily cleans the fine contaminants in the gravel. 2. An electric water changer can help you empty the water in the tank faster. 3. When the water passes through the filter, it isolates the waste and fulfills the function of clean water. 4. It will not pollute the water during work and will be safer for fish life. 5. Free length adjustment, when the water level is too low, the