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1. If the whole building is yours, you will dismantle and replace the pipes, and if you are a commercial house, you should find a property to repair it, otherwise you will be killed if there is a problem.
Listening to the situation you said, it is likely that your own sewer part is blocked, you can try to dredge it yourself first, 1. Use a leather puff to make a hard effort on the sewer. >>>More
You can go downstairs to your house and talk to your neighbors! Go to the top of their house! >>>More
It may be that small items such as socks are blocking the toilet, you can use a leather tiger to suck it, or you can find a professional toilet infusion.
There is no need to buy dredging agent, dredging agent is to prevent blockage in the case of no blockage, and it has a better effect. . . You try to rinse with boiling water a few times. If you can't do it, find a professional dredging, it seems that professional dredging is more cost-effective than dredging agents! ~
1 I have experience in all this, I have a shop that is always like this, you better plug the hole of the water, they don't pass it so quickly, and the water is too dirty.