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No, this is an illegal pollutant discharge, check the environmental protection law or water management measures, etc., which part is specific, some can't remember.
If the quality and installation of the toilet were fine, the situation you mentioned would not have happened.
This is definitely not possible, the kitchen is used to make a place for eating, and people's feces and urine are discharged into the septic tank after a lot of germs will breed, if from the kitchen, then the health situation is very bad, especially if there are elderly and children at home, the immunity is relatively low and it is easy to get sick, this thing must not be done.
OK. In many residential buildings, the sewer pipe of the toilet is connected with the sewer pipe of the kitchen with a tee, and then discharged into a sewage well and then to the septic tank.
It is better to install one that can buffer the pressure of the water.
All the sewage in life must be discharged into the septic tank.