In ultrasonic cleaning, it is a must to use the right amount of ultrasonic power or ultrasonic energy. WPG or watts per gallon is the unit of measurement of ultrasonic power. In order to determine how much ultrasonic energyshould be used, two elements should be taken into consideration. These are the size of the tank and the level of cleaning difficulty.
The needed ultrasonic energy is inversely proportional to the size of the tank and directly proportional to the level of cleaning difficulty. The smaller the tank, the lesser the energy needed; and the more difficult the cleaning, the more the energy needed. If the capacity of a tank is not more than two gallons, the ultrasonic cleaner can be operated with up to 150 WPG. For a 50-gallon tank, high quality cleaning can be achieved by using 25 WPG.
Keep in mind that using an inappropriately high amount of ultrasonic power will most likely result to cavitation erosion. Extra care should be taken when cleaning soft metals as these metals can be damaged if an extremely high amount of ultrasonic power is used.