Reason analysis: It may be that the height of the water seal of the floor drain is not enough, and it is easy to dry up, causing the odor in the drainage pipe to overflow into the room.
Solution: First, there may not be a water trap in the floor drain, just add one to it; second, change to a floor drain of the same brand and specifications. But during construction, be careful not to damage the waterproof layer. In addition, it should be reminded that in use, the water seal should be prevented from drying up, and water must be filled regularly. If you leave for a long time, it is best to seal the floor drain with a lid.

Analysis of the cause: It may be that the water flow section of the floor drain is not smooth enough, the sewage cannot pass through quickly, or the internal structure of the floor drain is convex and concave, which has caught hair, fibers and other dirt.
Solution: The height of the floor drain is determined by the pipe arrangement of the drainage system. Therefore, the height of the floor drain used with it is better to be within 200mm and 120mm respectively, and it must be drained laterally. Commonly used concealed installation methods are two kinds of local sinking cloth pipes on the structural floor of the bathroom and cushion cloth pipes for the bathroom. In order to meet the requirements of toilet headroom and ergonomics, the sinking headroom of the former is 300mm, and the cushion height of the latter is 170mm.

Solution: Open the floor tiles around the floor drain, excavate the surrounding cement to a depth of 3cm, and then seal it with a "plugging agent". After 1 hour, do a closed water test to observe whether it is still seeping. If it does not seep, it will be restored.