They all collect liquid on the floor and then transport it to the sewer. The difference is that the floor sink is a wash basin on the floor, usually 12 x 12, instead of just a hole. The health department usually requires indirect drainage equipment or sinks. If dirty water in the sewer is poured into equipment or sinks, it may pose health risks-ice makers, food sinks, soda / beer taps, etc. They trap solids while allowing the liquid to continue flowing. The washbasin is larger and has the function of storing water.

A floor drain is a sanitary device installed on the floor of a building and is mainly used to remove standing water nearby. They are usually round, but they can also be square or rectangular.

Floor drains are often used where air gaps are required at the equipment outlets, such as commercial restaurant appliances. They actually have a certain storage capacity, and usually have a drainage net and a removable furnace rate for repairing luminaires. Floor sinks are also 12 inches by 12 inches larger than most larger floor drains, where the drain is usually 4 or 6 inches in diameter. Floor drains in laundry rooms, machine rooms, and bathrooms usually allow the entire floor to be drained in and out. If the floor is properly tilted, the sinking is usually flat and flush with the adjacent floor.