Yes, this is required in a commercial restroom. Excess water is drained through the floor drain. It also eliminates odors from the toilet, urinal, or sink and adds a small amount of water after each cleaning. To reduce evaporation, you can also add mineral oil. They use memory rubber stair seals, which you can supply or supply stair primers. The floor drain is hidden beneath a sturdy partition. This will keep people from urinating down the drain. If you're putting in a floor drain, make sure it's at least 2 inches per square foot. This factor keeps your commercial restroom sanitary and odor-free.