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It is likely that the sewer pipe is broken, if there is a property, find the property to rectify,
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Look at whether the sewage riser in your home has a standing checkpoint, and the checkpoint is not sealed, so the water leaks out.
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It may be a leak in the inspection port.
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1. Is there any water leakage in your house for all 6th floor water? Is there any other special structure? What is the so-called leakage on the 4th floor, can you explain it clearly? Knowing this information may give you advice, otherwise it is ... Hehe.
If you want the property to go upstairs to negotiate who is in charge, it really doesn't matter, so you can find the civil department to coordinate.
The property definitely doesn't matter, it is recommended to directly glass the window.
You know, the main valve is not absolutely easy to use. Many main valves have water leaks or slight water leaks. If you don't understand, do a pressure test to see if there is a leak in your water pipes.
Upstairs leakage water distribution is certain, it is recommended not to use the lamp before the treatment of the virtual person pointed out, find the upstairs to negotiate and check, after the treatment (or the building is not sprinkled on the ground), open the lamp mouth to dry (hair dryer) It is best to check the insulation between the lines and continue to use the lamps after installing them.