One way to prevent this from happening is an established routine jetting service.
Jetting is a service used to keep drain lines clear of the debris that builds on the sides of the pipe walls. It dislodges material from catching in joints and small bends that could cause a backup. A utensil falling in the drain or food being pushed in the drain after closing are not a determining factor in preventive maintenance.
The simplest and cheapest thing you can do to prevent backups is make sure foreign objects don’t go down your drains. If you are missing any sink drains, you can go to this website to get almost any size: Drain Net
After you have confirmed that all your drains are protected, and you have confirmed that you are on an appropriate grease trap cleaning schedule, you can move to the final preventative step: establishing routine jetting maintenance. Having your drain lines routinely jetted 2-4 times per year is a simple, protective measure to ensure your business will not be interrupted and you will not be stung by hefty emergency rooter charges.