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Help! What if the property doesn't deal with the water leakage upstairs?

Open the manhole of your sewer riser and plug something that you can take out by yourself, so that the sewers upstairs are blocked. If your home has an upstairs, their sewers will come out from the people upstairs. Even if there is no upstairs in your house, their sewer can't go down. It will definitely work. Be careful not to fall off the block, or your home will be in big trouble.