Judging whether all drainage and sewage pipes have submerged bends can be seen by observing whether all drainage and sewage pipes have accumulated water. First of all, because of the particularity of the toilet, it basically comes with a latent bend. If the sewage pipe below is still flooded, it will affect the smoothness of sewage discharge and easily cause blockage. Therefore, toilets are generally self-contained. Directly open the toilet lid, you can see that there will be a water in the toilet, that is, there is a submerged bend, which has the effect of isolating the waste gas from the sewage pipe. If there is a floor drain, you can open the cover of the floor drain and illuminate the bottom of the floor drain with a flashlight. If you find a pool of water, it is a dive, otherwise it is not.
In addition to the self-contained submerged elbow in the bathroom, it is generally in the caisson in the bathroom. When making drainage and sewage pipes, they should be made in advance and then taken over as interfaces. Without them, the exhaust gas discharged from the pipeline will flow back, causing odor pollution.