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It is recommended that you wrap it in bricks on the outside of the drain! It can play a role in sound insulation! The drainage pipe of the general home decoration is in the bathroom, and the bricks will be used to build a circle around the pipe during the decoration, from the ground to the top, which can not only cover the ugliness, but also have a high sound insulation!
Why don't you give it a try?
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It could be a drain problem with you. Go and replace it.
Look at any of the bugs in there.
Have your water pipes cracked?
Check it out.
If the prankster knocks on the door at a regular time, you stay in the dark at that time, and when he appears, you subdue him and take him to the police station; Or you can prank him, buy a string of firecrackers to guard in the dark, as soon as he knocks on the door, you light the firecrackers and throw them at him, because if you are a thief, he will definitely be scared and run away, and never dare to knock on the door again.
Find a plumber or take matters into your own hands to find out the cause and rule it out. Don't just be suspicious.
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It's mold at work.
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