The GPM of a utility sink is the gallons per minute flow rate of the water. This is important to know because it will help determine how much water you can use without having to worry about overloading your system. Knowing the GPM of your sink will also help you determine the best way to clean it, as some cleaners may require more or less water than others. Generally speaking, the higher the GPM, the better; however, there are other factors to consider as well. Contact your local plumbing professional to learn more.