1. When selecting, it should be understood whether the depth of the water seal of the product reaches 50mm. Side wall floor drains, floor drains with screen frames, and closed floor drains generally do not have water seals; most of the overflow-proof floor drains and multi-channel floor drains have water seals. When selecting them, they should be specifically understood according to the manufacturer's information.

2. For floor drains without water seals, a water trap with a depth of not less than 50mm should be installed in the drain pipe. This component can be configured by the floor drain manufacturer, or set by the construction unit that installs the floor drain.

3. The height of the floor drain grate can be adjusted, and the adjustment height is not less than 35mm to ensure that the floor drain surface elevation is level with the ground after the ground decoration is completed. The floor drain is equipped with a waterproof wing ring to meet the waterproof requirements when the floor drain is installed on the floor.

4. The structure of the floor drain with water seal should be reasonable and smooth, and the debris in the drainage is not easy to settle; the cross-sectional area of each part of the water should be greater than the cross-sectional area of the discharge pipe, and the minimum clear width of the flow channel should not be less than 10mm.

5. In the wet area, such as the shower area, in order to ensure the smooth flow of the water, not only can it not be hidden, but it must be about 10mm below the ground.