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It's the reason for the sixth floor.
The flue only has an upper outlet, no lower pipe, and the water is discharged to the inside to find a place, so it is pulled out from the ground on the first floor.
The user on the sixth floor should have a special drainage pipe, and then connect it to the main drainage pipe of the unit or directly enter the well, and any place under the drainage pipe must be water-free!
If the drain from the bathroom on the sixth floor is also discharged into the flue, the flue of your unit will also become a septic tank!
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Report it to the property! That's what you do! Turn off the water valve!
Because it is the first floor, the possibility of sewer blockage is not large, the main thing is that the septic tank should be cleaned, and the amount of sewage is usually insufficient to cause too much sediment, so it should be cleaned regularly.
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