The Savior Ultrasonic Pool Pond Algae Sanitation Disinfection Systems 120-watt Solar Powered 30,000 Gallon algae control uses sound waves at specific vibrational frequencies. Like an opera singer can hit just the right pitch to break a wine glass, the Savior ultrasonic vibrations pass through the water in an all-around pattern causing the vacuoles inside the algae cells to resonate and break. It's in this way that the Savior Ultrasonic system actually kills or damages the algae. Since green water is made up of many, very small individual algae cells, the Savior ultrasonic sonic wave cuts through the algae growth. Savior ultrasonic continually works to damage the "outer wall" off the algae growth and slowly work to eliminate the algae over time.