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There should be a blockage in the upper vents, which is why the water flow is slow
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There are two reasons for this:
It may be caused by the blockage of the outdoor septic tank, because your home lives on the first floor, whether the outdoor septic tank is cleaned regularly;
Caused by clogged vents.
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Buy a pipe dredging agent, and there is sediment in the pipe after using it for a long time. There is also a possibility that the ground is sinking, and the drainage pipe will sink with it, causing the pipe to fall down, affecting the speed of the water flow.
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The outdoor septic tank should be checked for a lot of siltation!
To give you three suggestions, first, from the perspective of saving money, go to the building materials market by yourself and buy tools to solve it; Second, from the perspective of saving trouble, find an outside master or decoration company to solve it for you; Third, in the long run, complain about the property until the problem is resolved. Whatever the advice, you should make a judgment that is appropriate for you at the right time and in your best interest.
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Find the property and the neighborhood committee or the property committee community to coordinate and solve.
If the first floor plaque affects your rights, you can refuse it on the grounds of infringing on the rights of neighbors.