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If it is only the washbasin smell, as long as you install a water trap in the middle of the downspout, you can solve this problem, if the floor drain is also smelly, buy a odor inhibitor and press it to solve it, and the general hardware decoration store sells it at a low price.
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Our sewers smell too, and I use a lovely silicone lid that fits in a cup of water, and the kind that can be lifted up is much better when covered.
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The quickest and most cost-effective way is to replace the sewer cap. Buy the kind that can be filled with water.
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There is a problem with the back-bend. Add a new one. Or make a special plug to plug it.
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Install a row of fans to circulate air.
Replace the toilet with a toilet bowl or a toilet with a deodorant barrier.
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Put some white vinegar in the bathroom to absorb the smell.
It is necessary to consider that in winter, due to the north wind, there is no possibility of sewer odor backing up, and the way to prevent it is to keep it. >>>More
You can use boiling water to pass through, in the winter there is a kitchen drain is not smooth, the reason should be grease accumulation and solidification, this time as long as the kettle boils water, pour a pot of boiling water into the sewer pipe, you can hear the sound of slapping at this time, at this time the boiling water will be blocked by the grease to open up, the problem will be solved.
Ask if there is such a situation below, if people don't have it, they will first contact their own home, and try all of them. If it doesn't work, let the property check the main pipe.
That's a matter for the developer, builder, or property.
Did the landlord find out the reason later?