Top Reasons for Toilet Water Backflow into Floor Drain

Toilet issues arising from long-term use can significantly affect normal usage, necessitating timely intervention. One common problem is the backflow from the floor drain when flushing the toilet. What causes this?

Reasons for toilet flushing causing floor drain backflow：

1、Floor Drain

If the floor drain is a standard type, its drainage capacity may be inadequate, especially considering the large volume of water from the bathroom. Consequently, flushing the toilet can result in blockages. In such cases, it is advisable to replace the floor drain with one that has anti-backflow functionality.

2、Drainage Pipe

After the main drainage pipe for the bathroom is installed, a T-junction is typically needed about ten centimeters from the top. If the branch pipes connected are excessively long and lack a proper slope during installation, it could lead to a reverse slope, causing backflow when the toilet is flushed. In this situation, the drainage pipe should be reinstalled with an appropriate slope.

3、Pipe Fittings

The main drainage pipe and the branch pipes should be connected using T-junctions, and each upward branch route also requires a T-junction. Special attention should be given to the connection point between the branch pipe and the floor drain, where a T-junction is essential. If the T-junction is installed incorrectly, the large volume of water during flushing may flow along the incline to the floor drain, resulting in backflow. The improperly installed T-junction needs to be removed and reinstalled correctly.

4、Main Water Pipe

If the main water pipe in the bathroom is blocked, the drainage from the toilet may not flow down swiftly. This results in water accumulating in the pipe, and once the volume increases, backflow occurs at the floor drain. In such cases, it is recommended to seek professional assistance to clear the blocked pipe.

summary：The above provides a detailed explanation of the reasons behind toilet flushing causing floor drain backflow. Hopefully, this information can assist those in need. If you would like to learn more related knowledge, continue to follow our Hawkrown website for more exciting content in the future.