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Could it be that the floor drain of the floor drain of the bathroom comes out, and if the bathroom is not used, just put a piece of something to cover it.
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It is the smell in the sewage pipe that backs up, it is recommended to check the macro suction system of the lower toilet.
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Is there a rat dead in it, pay attention, multi-family disinfection, market cleaning, now these things can be drilled everywhere, the day before yesterday we also found rats in the storage room of our house, scared me to death.
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It is that the pipeline does not add a water trap, which causes the odor to backflow, and the water trap is OK
It is normal to have less than 8 times. More than eight times ... It's not normal.
Water leakage is always bad, although a little, but it can also flood, damage the wall and not to mention, leakage and leakage!
Go to the hospital for surgery, it's hemorrhoids.
In addition to a small section of waterproofing, it would be nice to get some waterproofing again.
Don't overthink it, it's just a coincidence.