How to deal with the anti-water on the first floor

Connect the horizontal drain pipe on the second floor to the main ventilation riser with the ventilation riser. That's what I did when I designed it. If your architectural design doesn't do this, you can connect it yourself.

2. The sewage and garbage in the toilet are diverted, the toilet is connected with the toilet drainage riser, and a one-way valve is set at the bottom of the toilet. The other drainage of the bathroom is best connected to the drainage riser of the balcony washing machine (provided that the balcony drainage riser is discharged to the sewage system, otherwise it will be discharged to the rainwater system, which will pollute the environment). In addition, the horizontal branch pipe of kitchen drainage can be connected with a valve by itself. If the vertical pipe and horizontal main pipe of kitchen drainage are blocked, close the valve and keep it normally open.

The methods mentioned above are all aimed at dealing with the blockage of vertical drainage pipes and horizontal main pipes. As for the blockage of outdoor main drainage pipes, I don't know.