The pump seems to be louder than the sound of the water noise, why?
Make sure water level is properly maintained as well as making sure the pump is properly installed in the reservoir. Most times, if the water level is accurate, setting the pump on foam or scouring pad can reduce the vibration against the reservoir. If your pump is older, it may be starting to show signs of the end of its life. In that case, call VODA Water Features and we will be happy to assist in replacement.