1.Make sure put enough water in the fountain, so pump can stay underwater completely.When the water pump is just immersed in the water, because there is air in the water pump, it is recommended to wait for the water pump to spray normally before inserting the nozzle.2.This product is a solar direct-drive water pump without an external battery. The height of the water spray depends entirely on the strength of the sun. When the sun is weak, the pump will not work continuously, but will automatically start repeatedly until the sun reaches a certain intensity After that, the pump resumes continuous operation.3.Solar panels must be completely exposed to the sun,please avoid leaves or shadows blocking the solar panel.4. Please keep the water source clean and clean the water pump regularly to prevent foreign matter from being sucked in by the water pump and causing the water pump to fail to work normally.