It is very important to prevent water from flowing back from the floor drain, because if you don't pay attention, it may bring many problems, such as wetting the ground or walls, increasing the risk of slipping and attracting insects and bacteria to breed. Here are some of the best ways to prevent water from flowing backwards:

1. Make sure that the floor drain is installed correctly. The floor drain should be installed in the correct position to ensure that the drainage pipeline is correct and complete.

2. Install the backflow preventer. Anti-backflow valve can prevent water from flowing backwards, forcing water to flow only in one direction.

3. Regularly clean the floor drain and drain pipe. Regular cleaning of floor drains and drains can reduce the possibility of blockage and keep the water flowing smoothly.

4. Use a filter to prevent clogging. Installing a suitable filter can prevent dirt and debris from passing through the floor drain, leading to blockage and water backflow.

5. Make sure to use the correct detergent. Using too much detergent or the wrong type of detergent may generate foam and block the drain pipe.

6. Provide adequate ventilation. Ventilating the room can help release moisture and prevent the floor drain from overflowing due to excessive futures flow.

In a word, the best way to prevent groundwater leakage and backflow is to keep the facilities in good condition and properly maintain them. Pay special attention to details during installation and use.