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The responsibility of the fourth floor is not big, and people are not allowed to drain water, but the sewer pipe on the first floor is fine, and the water discharge is slow, resulting in the second floor backwater, if the fourth floor is slow to release water, there will be no problem, who opens too fiercely.
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The fourth floor is responsible, if the sewer is PVC material, so high water temperature is easy to burn. Find the property and ask the fourth floor.
This value is generally introduced from outside the building, when the pipe enters the building, bend down a bend, the rain will go down, if it has been installed, it can be tied to half a soft pipe down, 50CM rain will also flow down the pipe, such as from the roof of the building, the hose can be made into an umbrella and tightened, and it will not leak rain.
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Just leave it for a while, because the water pipe is relatively long.
There is almost no water pressure. The water pressure is the so-called height difference, which is basically negligible in the same plane.